4x+5y=-43
6x+7y=-6(-2)
4x+5y= -12 /6
6x+7y= 12 / (-4)
24x+30y= -72
-24x-28y= -48
2y= -120
y= -60
4x+5y= -12 /(-7)
6x+7y= 12 / 5
-28x-35y= 84
30x+35y=60
2x=144
x=72
x=72
y= -60
Spr
L1=4x+5y=472+5 (-60)= 288+(-300)= -12
L1=P1
L2=6x+7y=672+7(-60)=432 -420= 12
L2=P2