x+y=8 15*x+3*y=60
x+y=8
15*x+3*y=60
x+y=8 |*(-3)
15x+3y=60
-3x-3y=-24
-12x=36 |:(-12)
x= -3
-3+y=8
y=8+3
y=11
x=8-y
15(8-y)+3y=60
120-15y+3y=60
-12y=-60
y=5
x=3
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x+y=8
15*x+3*y=60
x+y=8 |*(-3)
15x+3y=60
-3x-3y=-24
15x+3y=60
-12x=36 |:(-12)
x= -3
-3+y=8
y=8+3
y=11
x= -3
y=11
x=8-y
15(8-y)+3y=60
120-15y+3y=60
-12y=-60
y=5
x=3