Question

how do you solve:
7x+4y=-4
5x+8y=28 in elmination

Answer 1

Multiply the top equation by 2.

Then subtract the bottom equation from the top.

Answer 2

well first for the 1st equation move everything to one side except y.

You should have y=-1+7/4

now plug that y=1+7/4 into the second equation

8x+8(-1+7/4)=28
8x+6=28
8x=22
x=2.75 or 2 3/4

ok you just found what x is. now plug the value of x back into the first equation

7(2.75)+4y = -4
4y = -23.25
y= -5.8125

I might have done my math wrong, but the process should be right.

Answer 3

baylee, ignore Don. He did not do it by elimination as specified.

Don, stop it.

Answer 4

oh haha sorry. just trying to help.