exam Maths Puzzle Numerical Ability

What is the equation of the line whose slope is -4 and whose y - intercept is 5?

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exam Other Question

Please help me to solve the following problem:

Perform the indicated operation:
x^3-1/x^2+1 divided by 9x^2+9x+9/x^2-x

Thank you very much!
Solve each system by the addition method.

(1/8)x+(1/4)y=3
(1/16)x+(1/2)y=7


and

1.5x-2y=-0.25
3x+1.5Y=6.375