12x-7y=2
4x-5y=6
y=0.8x-1.212x-7y=212x-7*(0.8x-1.2)=2
6.4x+8.4-2=0
6.4x+6.4=0
x=-6.4/6.4
x=-14x-5y=64*(-1)-5y=6
y=-10/5
y=-2
12x-7y=2
4x-5y=6
4x-5y=6
y=0.8x-1.2
12x-7y=2
12x-7*(0.8x-1.2)=2
6.4x+8.4-2=0
6.4x+6.4=0
x=-6.4/6.4
x=-1
4x-5y=6
4*(-1)-5y=6
y=-10/5
y=-2