(6,-2) is true for 4x-3y=30 but NOT for 3x+2y=22.
4*6=24
3*(-2)=-6
24-(-6) changes to 24+6 which equals 30
24+6=30.
3*6=18
2*(-2)=-4
18+(-4) would be changed to 18-4
18-4=14
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