there are so many ways of doing this problem! you can solve for x or y.
let's solve for x.
when u solve x= 1/4y-41/4
plug that value of x into the other equation: 6x+3y=-21
it should look like this
6(1/4y-41/4)+3y=-21 and solve for y
after u solve for y
plug it in to whatever equation & solve for x and then u check it.
you can do it vice versa & solve for y first if you want too:)
from the 2nd: y = 41-4x
sub into the 1st:
6x + 3y = -21
6x + 3(41-4x) = -21
6x +123 - 12x = -21
-6x = -144
x = 24
sub into y = 41-4x = 41-4(24) = -55
x = 24
y = -55
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