Question

you have to use the substitution method
-3x+3y=4
-x+y=3

Answer 1

-3x+3y=4......(1)
-x+y=3......(2)
-x=3-y. = x = -3+y
put the value of x in (1)
-3(-3+y)+3y=4
9-3y +3y= 4
9-0=4
there is no value for y
so the equation has no solution