Question

$x - 56 + 7 - 8 + 3 + x - y = 80$
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Answer 1

Answer:

5x + 3y = 9 -----(I)

2x - 3y = 12 ----- (II)

Add (I) and (II)

7x = 21

x = 3

Putting the value of x = 3 in (I) we get

5(3)+3y=9⇒15+3y=9⇒3y=9-15=-6⇒y=-2

Thus, (x, y) = (3, -6).

Answer 2

$x - 56 + 7 - 8 + 3 + x - y = 80 \\ 2x−54−y=80 \\ −54−y=80−2x \\ −y=80−2x+54 \\ −y=−2x+134$