exam Maths Puzzle Numerical Ability

What is the equation if the line perpendicular to y= 2x + 7 and is passing through (1, -8)

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exam Other Question

A) -4 -3 -4Z = 1
-5 +1Y +2z =-34
5X -1Y = 28

B) 5X +5Y -1z =21
3X -2Y -4Z =48
4X -4Y -1Z =42 I just need the set up. I think from there I can figure out the answer.

The volume of the box is represented by (x^2+5x++6)(x+5). Find the polynomial that represents the area of