Asked by baylee
how do you solve:
7x+4y=-4
5x+8y=28 in elmination
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.
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.
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.
Don, stop it.
Answered by
Don
oh haha sorry. just trying to help.