solve the simultaneous equation x+2y = 5 ; y = -2x-2
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x+2y=5....(1)
2x+y=-2...(2)
multiply eqn (2) by 2
=4x+2y=-4....(3)
add eqn (1)&(3)
x+2y=5
4x+2y=-4
-3x =9
x=9÷-3
x= -3
substituting x= -3 in eqn (1)
x+2y=5
-3x+2y=5
2y=5+3
2y=8
y=8÷2
y=4
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