exam Maths Puzzle Numerical Ability

i dont get 2=3x-13.
i really dont get the inverse.

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exam Other Question

Evaluate
(-4x)small 2 and -4x small2 when x = 4

I did not know how to put the small 2 next to the number sorry find x and y
2x + 3y = 6
3x - 4y = -3