Answer:
x = -17
y = -68
Explanation:
x - y = 51
y/x = 4 so we can say that y = 4x
using substitution:
x - 4x = 51
-3x = 51
find 'y':
-17 - y = 51
-y = 68
check:
-17 - (-68) = 51
51 = 51
-68/-17 = 4
4 = 4
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