Asked by baylee

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

Answers

Answered by bobpursley
Multiply the top equation by 2.

Then subtract the bottom equation from the top.
Answered by Don
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.
Answered by bobpursley
baylee, ignore Don. He did not do it by elimination as specified.

Don, stop it.
Answered by Don
oh haha sorry. just trying to help.

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