Question

solve x+2y=13
4x+8y=-9

choices
(3,5)
(-1,7)
no solutions
infinitely many solutions

Answer 1

Any Ideas? :)

Answer 2

no im really lost

Answer 3

Steps:
I will try to solve your system of equations.
x+2y=13;4x+8y=−9
Step: Solvex+2y=13for x:
x+2y+−2y=13+−2y(Add -2y to both sides)
x=−2y+13
Step: Substitute−2y+13forxin4x+8y=−9:
4x+8y=−9
4(−2y+13)+8y=−9
52=−9(Simplify both sides of the equation)
52+−52=−9+−52(Add -52 to both sides)
0=−61
Answer:
No solutions.

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Answer 4

thank you so much can u help with another?

Answer 5

solve 3x-5y=17
9x-15y=-4

Answer 6

Multiply the first equation on both sides by 3. What do you get?

Answer 7

9x-15y=17

Answer 8

Clearly, tso will be helping you with this. So I'm out. :P

Answer 9

thank u for your help !

Answer 10

You have to multiply 3 on both sides. You fogot to multiply 17 by 3.

You would have gotten
9x - 15 = 51

The two equations right next to each other are
9x - 15y = 51
9x - 15y = -4

What would happen if you subtract the second equation from the first one? What do you get? :)

Answer 11

im not sure

Answer 12

For example

2x - 5y = 2
3x + 5y = 3

If we subtracted, we would get:

2x - 5y - (3x + 5y) = 2 - 3
And then you simplify it

It's basically like (a much more easier example)
x = 5
y = 4

subtract both equations
x - y = 5 - 4
and when you simplify it
x - y = 1
Which makes sense if x = 5 and y = 4

Answer 13

the choices are
(-1,-4)
(4,-1)
no solutions
infinitely many solutions

Answer 14

would it be d then??

Answer 15

Nope!

Remember if you get something like 3 = 3, (which is always true), then you have infinitely many solutions.
If you get something like 1 = 3, (which is false), then you have no solutions
If you get something like x = 1, or y = 3, then you have one solution

You can NEVER have two solutions in a system of linear equations

Answer 16

The lines are parallel. hence no solution exists.

Answer 17

For any lines to be parallel with no solutions the slopes of both the lines should be equal and the constant should be different.

Answer 18

*facepalm*

Answer 19

For the lines to have infinitely many solutions.
1. lines should be parallel i.e. same slope
2. the constant of both the equations should be same.

Answer 20

Go with C no solutions. :)

Answer 21

I fail to see how giving the asker the answer helps him learn how to do it.

Answer 22

@TheSmartOne I think I gave u the explanation. Perhaps u don't have to solve every problem to find the answer. It's easily visible when u look at slopes and constans of the equations.

Answer 23

im a girl and tso u didnt even get it right so

Answer 24

constants*

Answer 25

and it does help so i can look at what they told me and see the steps to get the right answer THNAKKSSS PRINCE HARRY

Answer 26

well, pretty good with me. hv a good luck solving problems u need not solve for answers :)

Answer 27

Yes, I was able to see that it had no solutions right away BUT the asker will not be able to see it without practice. That's why I asked her to multiply the equations by 3 and to subtract the equations. Both variables would be eliminated and an untrue equation would remain which would show that there was no solution.

The first question, she got an answer. I highly doubt she understood what was happening. She took the answer and asked for help on the next question.