If you mean 6x + 4y, then
4y=(-6x+24)
y=(-6x+24)/4=
y=(-3/2)x+6
b=6
If you mean 6x - 4y then
-4y=(-6x+24)
y=(-6x+24)/-4
y=(3/2)x-6
b=-6
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3x-2y=24 (1)6x-4y=-6 (2)(1) => 6x-4y=48 [(1)*2](1)*2=(2)therefore:6x-4y = -6 AND 48-6 ≠ 48the equation cannot be solved
6x = 32 - 4y and 4y - 8 = 6x so 32 - 4y = 4y - 8 ie 40 = 8y so y = 5 and x = 2
3
2p = 4y - 12xy - 6x, 3q = 12 - 15y so 2p - 3q = 4y - 12xy - 6x - (12 - 15y) = 4y - 12xy - 6x - 12 + 15y = 19y -12xy - 6x - 12
x=5, y=6 (6x5) + (4x6) 30 + 24=54