Question

What is the value of the y variable in the solution to the following system of equations?
5x + 4y = 1
4x + 3y = -1

-7

7

9

-9

Answer 1

@kiszer4148

Answer 2

Do you know how to set this up get rid of one of the variables?

Answer 3

hmm.. do something on both sides?

Answer 4

add 3y on both sides?

Answer 5

you can set it up a few different ways. I will go over the way that i most commonly used.
we need to get rid of the variable x from the problem.
So we need to multiply the whole top equation by 4 and the whole bottom equation by 5.
So you will be left with this
20x+16y=4 and also
20x+15y=-5

Answer 6

Now you can simply subract the two equations to get:
0x+1y=9
remember that 4-(-5) is 9
so the answer to this problem is a positive 9

Answer 7

wow! thanks for the help! really grateful! I highly appreciate it! thanks so much! so nice! thanks!