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Assume the first equation is E1: -x+4y=20
Assume the second equation is E2: -7x+4y = -4
Since both equation include 4y, we could eliminate y first.
So E1 - E2: -x+4y - (-7x+4y) = 20 - (-4)
-> -x+4y+7x-4y = 24
-> 6x = 24
-> x = 4
Thus substitute x = 4 to either E1 and E2, and I will just substitute it into E1: -x + 4y = 20 -> -4 + 4y = 20 -> 4y = 24 -> y = 6
Therefore, x = 4 and y = 6
If you're trying to find the x the first one would be:
x=4y-20
And the second one would be
x=-4y-4 above -7
(..though, you might need to re-check my answer for the second one)
Add your answer:
Earn +20 pts
4y20 equals 500 and x plus y equals 500?
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Rewrite the equation 4x 4y20 in slope-intercept form?
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