Question

X + 5y = 12

X + 7y = 22

By elimination method

Answer 1

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Answer 2

(x+5y=12)*7
(x+7y=22)*5
7x+35y=84
5x+35y=110
when we add
7x+35y=84
+5x+35y=110
- - -
2x=-26
x=-12
put value of x=-12 in equation 1
7x+35y=84
7*(-12)+35y=84
35y=84+84
35y=168
y=168/35