exam Maths Puzzle Numerical Ability

Rewrite the equation -8x - 5y = -45 as a function of x.

thank you.

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exam Other Question

which one of these numbers are prime and how do i show my work?
12,31,99,1

i think 1 is prime because you only have 0,1 direct.

Problem #5
Find the length x. Express your answer in simplified radical form.

leg 1: 45ft
Leg 2: x
Hypotenuse: 51ft

My answer: 4ft is the simplied radical form.