4x+3y=6
2x+y=4
y=4-2x
4x+3(4-2x)=6
4x+12-6x=6
12-6=-4x+6x
6=2x
x=3
y=4-6
y=-2
2x+5y=25
4x+3y=15
2x=25-5y
2(25-5y)+3y=15
50-10y+3y=15
10y-3y=50-15
7y=35
y=5
2x=25-25
2x=0
x=0
4x+3y=-5
6x+5y=-7
4x=-5-3y
x=(-5-3y)/4
-6(5+3y)/4+5y=-7
(-30-18y)/4+5y=-7
-7.5-4.5y+5y=-7
0.5y=0.5
y=1
x=-8/4
x=-2