exam Maths Puzzle Numerical Ability

You are told that a line has a slope of -3 / 4 and that the line passes through the point given by ( -2, 3 ). Choose two other points from those given below which are on this same line.

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Please check for me.

I have factored 3a^2(a-b)-6a(a-b)+21(a-b)

I got 3(a-b)(a^2-2a+7).

Thanks
please solve the system
3x+4y=-2
x=-2y