(vi) 2x - 7y = 7; 3x + y = 22
by substitution method
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2x−7y=7 __(1) , 3x+y=22×7
⇒21x+7y=154 __(2)
Adding (1) and (2)
2x−7y=7
21x+7y=154
______________
23x=161
x=7
2x−7y=7
2×7−7y=7
7y=14−7
y=1
∴x=7,
y=1
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