Multiply the top equation by 2.
Then subtract the bottom equation from the top.
how do you solve:
7x+4y=-4
5x+8y=28 in elmination
4 answers
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.
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.
baylee, ignore Don. He did not do it by elimination as specified.
Don, stop it.
Don, stop it.
oh haha sorry. just trying to help.