Answer:
first one, put value of x= -3 and y = 0
second one, pit vale of x=7 and y= -7
Explanation:
first one,
-14(-3) -20(0) =42
or, 42-0 = 42
or, 42 = 42
proved
second one,
-14(7) -20(-7) = 42
or, -98 + 140=42
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