exam Maths Puzzle Numerical Ability

Find the product of the cube of (-4/3) and square of (-3/2).

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exam Other Question

This is from a worksheet:

Determine whether the pair of lines is parallel, perpendicular, or neither.

3x - 4y = -6 and 8x + 6y = 2 2x+2y+3z=13
-3x+4y-z=5
5x-3y+z=2

solve a system of 3 linear equations in 3 variables by the addition method. I keep coming up with fractions for x variable. i must be missing something in one of steps.