Solve the simultaneous equations
x+2y=−1
x=5+y
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Given x+2y=-1........(ii)
x=5+y..........(i)
Substitute (i) in (ii)
5+y+2y=-1
3y+5=-1
3y=-6
y=-2
From( i)
x=5+(-2)
=5-2
=3
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