Explanation:
A. to make the quadrilateral a parallelogram, we have:
7y + 5 = 8y - 4
112 = 10x - 8
<=> y = 5 + 4
120 = 10x
<=> x = 12
y = 9
B.we have:
17 = 4x + 5
63 = 8y - 1
<=> 12 = 4x
64 = 8y
<=> x = 3
y = 8
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