tolong yg bisa jawab teman

3x - 4y = 17. x2.
2x + 5y = -4. x3.

6x - 8y. = 34
6x + 15y = -12
-23y = 46
y = -2

sub y= -2 ke
2x + 5y = -4
2x + 5(-2)=-4
2x = 6
x = 3

sub x=3 y=-2 ke
4x-3y
4.3 - 3.(-2)
12+6=18 (A)