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Mathematics 9 Online
OpenStudy (anonymous):

Select an ordered pair from the choices below that is a solution to the following system of inequalities: 3y < -9 -8 > 2x hlp me plzzz

OpenStudy (anonymous):

y<-3

OpenStudy (texaschic101):

3y < -9 y < -9/3 y < -3 -8 > 2x -8/2 > x -4 > x we have y being less then -3 and x being greater then -4 (-3,-4) @primeralph ....would this be an ordered pair that is a solution to this ??

OpenStudy (texaschic101):

oops wait....x is less then -4

OpenStudy (anonymous):

no its Answer (-4, 0) (-5, -4) (-3, -2) No solution

OpenStudy (texaschic101):

y is less then -3 and x is less then -4 I think it might be (-5,-4)

OpenStudy (anonymous):

wat abt Select an ordered pair from the choices below that is a solution to the following system of inequalities: 5y < -3 − 3x 3x + 5y > 18 Answer (0, 0) No solution (8, -2) (-4, 0)

OpenStudy (texaschic101):

because -4 is less then -3 and - 5 is less then -4.

OpenStudy (texaschic101):

well...we might have to substitute the values into the inequality and see what is true

OpenStudy (anonymous):

ok

OpenStudy (texaschic101):

5y < -3 - 3x :(8, -2) 5(-2) < -3 - 3(8) -10 < -3 - 24 -10 < -27 (this is true) 3x + 5y > 18 3(8) + 5(-2) > 18 24 - 10 > 18 14 > 18 (not true) It is not (8,-2) 5y < -3 - 3x (-4,0) 5(0) < -3 - 3(-4) 0 < -3 + 12 0 < 9 (true) 3x + 5y > 18 3(-4) + 5(0) > 18 -12 + 0 > 18 -12 > 18 (not true) It is not (-4,0) 5y < -3 - 3x (0,0) 5(0) < -3 - 3(0) 0 < -3 (not true) I do not think their is a solution for this.

OpenStudy (anonymous):

what abt Select an ordered pair from the choices below that is a solution to the following system of inequalities: 3x − 4y > 7 y < 2x + 3 Answer (3, -3) No solution (-4, -1) (6, 3)

OpenStudy (texaschic101):

3x - 4y > 7 (3,-3) 3(3) - 4(-3) > 7 9 + 12 > 7 21 > 7 (true) y < 2x + 3 -3 < 2(3) + 3 -3 < 6 + 3 -3 < 9 (true) lucked out and got it on the first try.....solution is (3,-3)

OpenStudy (anonymous):

Select an ordered pair from the choices below that is a solution to the following system of inequalities: 2x > -5 + 3y 2x − 5y < -6 Answer (-1, 1) (4, 3) (3, -1) No solution

OpenStudy (texaschic101):

do you see how I am doing these ?

OpenStudy (anonymous):

no nt at all

OpenStudy (texaschic101):

just sub your x and y coordinates in and see if the inequality is true. It has to be true for both inequalities for it to be a solution

OpenStudy (anonymous):

so -1,1

OpenStudy (texaschic101):

I haven't done it yet....but I can't keep doing these or I will get suspended

OpenStudy (anonymous):

oh ok man

OpenStudy (texaschic101):

just sub in your x and y values and see of the inequality is true. Remember, it has to be true for both inequalities for it to be a solution

OpenStudy (anonymous):

ill try

OpenStudy (texaschic101):

in your solution sets.....the first number is x and the second number is y (x,y)

OpenStudy (anonymous):

so 2(1)>-5+3(-1)

OpenStudy (texaschic101):

2x > -5 + 3y (-1,1) sub -1 in for x and 1 in for y and see if the inequality is true. If it is, try it with the other inequality, if it is not, you do not need to go any farther because you know it won't work. You can do this.

OpenStudy (texaschic101):

x is the first number and y is the second number

OpenStudy (anonymous):

so thn it 2>-5+-3

OpenStudy (texaschic101):

2x > -5 + 3y (-1,1) 2(-2) > -5 + 3(1)

OpenStudy (texaschic101):

oops...2(-1) > -5 + 3(1)

OpenStudy (anonymous):

thts wht i did

OpenStudy (anonymous):

can somebody plz help me

OpenStudy (texaschic101):

-2 > -5 + 3 -2 > -2 (is this true or false)

OpenStudy (anonymous):

thn i gt 2>-5+-3

OpenStudy (anonymous):

uhmm true

OpenStudy (texaschic101):

how are you getting 2 positive and where is the -3 coming from

OpenStudy (anonymous):

no false its equal right

OpenStudy (texaschic101):

it is false....-2 is not > then -2....so this solution will not work

OpenStudy (anonymous):

oh

OpenStudy (texaschic101):

so now you just move on to the next solution and see if it works on both inequalities

OpenStudy (texaschic101):

remember x is the first number and y is the second number

OpenStudy (anonymous):

4,3

OpenStudy (texaschic101):

x is 4 and y is 3.....just sub it into your first inequality and see if it is true

OpenStudy (anonymous):

2(3)>-5+3(4)

OpenStudy (texaschic101):

correct......continue

OpenStudy (texaschic101):

wait....wrong

OpenStudy (anonymous):

6>-5+12

OpenStudy (anonymous):

wht

OpenStudy (texaschic101):

2x > -5 + 3y (4,3) 2(4) >-5 + 3(3)

OpenStudy (texaschic101):

x is the first number and y is the 2nd

OpenStudy (anonymous):

so 8>-5+9

OpenStudy (texaschic101):

your on the right track now

OpenStudy (anonymous):

now what

OpenStudy (texaschic101):

what is -5 + 9

OpenStudy (anonymous):

4

OpenStudy (texaschic101):

so now you have : 8 > 4.....is this true or false

OpenStudy (anonymous):

false

OpenStudy (texaschic101):

do you know what the signs mean < and > ?

OpenStudy (anonymous):

no

OpenStudy (texaschic101):

> means greater then < means less then 8 > 4.....this is saying 8 is greater then 4......is that true

OpenStudy (anonymous):

oh ok so 4,3

OpenStudy (texaschic101):

don't know yet.....it may work for this inequality, but for it to be a solution, it has to work for both. So now you have to try (4,3) in the other inequality

OpenStudy (anonymous):

ok

OpenStudy (texaschic101):

these problems are not hard, but they are time consuming

OpenStudy (texaschic101):

2x - 5y < -6 (4,3) try it

OpenStudy (anonymous):

yeah im starting to get it

OpenStudy (anonymous):

so its 2(4)-5(3)<-6

OpenStudy (texaschic101):

yes...continue

OpenStudy (anonymous):

so thn 8-15<-6

OpenStudy (texaschic101):

your are doing good......now just finish

OpenStudy (texaschic101):

what is 8 - 15 ?

OpenStudy (anonymous):

so -7<-6

OpenStudy (anonymous):

so its true i thnk

OpenStudy (texaschic101):

yes....it is saying -7 is less then -6.....that is true. Negatives can be confusing. They are kinda the opposite of positive numbers. -7 IS less then -6. So it works for both inequalities, therefore,it is the solution

OpenStudy (anonymous):

omg im geting it nw im goin to try Select an ordered pair from the choices below that is a solution to the following system of inequalities: 3x < -3+ 2y y − 2x > 4 Answer (0, 4) (-6, 0) (0, 6) (6, 3)

OpenStudy (texaschic101):

you know how to start this.....lets see what you can do

OpenStudy (anonymous):

3x<-3+2y

OpenStudy (texaschic101):

now sub in your solution and see if it is true

OpenStudy (texaschic101):

(0,4) ---- x = 0 and y = 4

OpenStudy (anonymous):

3(0)<-3+2(4)

OpenStudy (texaschic101):

your getting this...good job....now finish

OpenStudy (anonymous):

0<-3+8

OpenStudy (texaschic101):

and what is -3 + 8

OpenStudy (anonymous):

5

OpenStudy (texaschic101):

so we have 0 < 5......is this true

OpenStudy (texaschic101):

< means less then

OpenStudy (anonymous):

false

OpenStudy (texaschic101):

0 is less then 5......true or false

OpenStudy (anonymous):

oh true

OpenStudy (texaschic101):

now you have to try it with the other inequality

OpenStudy (anonymous):

ok

OpenStudy (texaschic101):

y - 2x > 4 (0,4).....x = 0 and y = 4

OpenStudy (anonymous):

so (4)-2(0)>4

OpenStudy (texaschic101):

correct

OpenStudy (texaschic101):

now you need to finish the problem

OpenStudy (anonymous):

8 than 0>

OpenStudy (anonymous):

can we take a 15 min brake my head hurt

OpenStudy (anonymous):

do you mind

OpenStudy (texaschic101):

no.... 4 - 2(0) > 4 4 - 0 > 4 4 > 4 not true.....4 is not less then 4, it is equal, so this solution is not correct I am sorry but I am fixing to have to go somewhere....you can do this....again, I am sorry that I cannot continue

OpenStudy (anonymous):

its ok

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