book Maths Puzzle Numerical Ability

how do solve by graphing: x+y=-1
3x-y=-7

Read Solution (Total 0)

book Other Question

Solve the equasions x+4=-1: 5b=-25: 3x+4=13: 5(x-2)=15: x+8=3(x-4)i tried 4+1=5is it right -1/5 (3x + 4 ) = 1