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From the first equation, substitute y = 4x into the second equation.
You will get
8x - 4(4x) = -40,
8x - 16x = -40
-8x = -40
x =
=
= 5.
Then from the first equation y = 4x = 4*5 = 20.
ANSWER. x= 5, y= 20.
Solved.