Question

solve by the substitution method
5x-5y=-20
7x+46=y
the solution is ( ) type and ordered pair
or there is no solution

Answer 1

5x-5(7x+46)=-20
5x-35x-230=-20
-30x=230-20
-30x=210
x=-7

y=7x+46
y=7(-7)+46
y=-49+46
y=-3

Answer 2

replace y in the first equation by 7x+46 to get
\[5x-5(7x-46)=-20\] and solve for x

Answer 3

what pat said!

Answer 4

the ordered pair is (-7,-3)

Answer 5

satellite?
what do you mean?

Answer 6

i mean you are right!

Answer 7

ah, i see.
i thought, it is the other way around..lol

Answer 8

so no reason for me to continue to write it out.

Answer 9

i am sorry if i am too fast to answer.

Answer 10

thanks pat18

Answer 11

you are welcome^_^

Answer 12

Pat18 can you help me with this one it is a little different
solve by the substitution method
4m+n=21
m-2n=12

Answer 13

okay..

Answer 14

4m+n=21
m-2n=12------> m=2n+12

4(2n+12)+n=21
8n+48+n=21
9n=21-48
9n=-27
n=-3

m=2n+12
m=2(-3)+12
m=-6+12
m=6

Answer 15

thanks again pat 18 you're very smart this stuff is new to me i have not had math in years

Answer 16

so pat what is the ordered pair or is there no solution

Answer 17

the ordered pair is (-3,6) for (n,m)

Answer 18

Pat 18
could you recheck the system tells me that is not correct

Answer 19

this is correct.
i got the correct answer.

Answer 20

ok maybe I made a typo this is the correct way to type and ordered pair
(-3,6) correct

Answer 21

yeah, that is what i got.

Answer 22

Pat18
the system say to begin by solving either equation for either variable, substitute the resultiing expression into the other equation and solve to find the value of one variable. Use back-substitution to find the value of the other variable. there is no solution if both variables are eliminated and a false equation reamains.

Answer 23

yeah, i used the substitution.i substituted the value of y in the equations.

Answer 24

so there is no solution