exam Maths Puzzle Numerical Ability

i need help with the following:

A line passing through (-8, 2) and (-1, y) is perpendicular to a line with slope . Find the value of y.

thank you

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exam Other Question

if a small company produces both standard and deluxe playhouses. The standard playhouses take 12 hours of labor to produce, and the deluxe playhouses take 20 hours. The labor ava right now were doing matrices and i was wondering if i got the answer right the problem is
and this is the answer i got:
[1 2 3] [ 0 -1 2