exam Maths Puzzle Numerical Ability

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

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exam Other Question

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 What is the equation for: twelve less than the quotient of a number and 8 is -1