How do you solve -2x + y = -1 and x + y = 5?
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-2x + y = -1 ________________(i)
x + y = 5 ___________________(ii)
Subtract (i) from (ii)
x + y -(-2x + y) = 5 -(-1)
x + y + 2x - y = 5 + 1
3x = 6
x = 2
Putting value of x in (ii)
2 + y = 5
y = 5 - 2
y = 3
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