book Maths Puzzle Numerical Ability

Rearrange the following so that the given letter becomes the subject:

-x = z - by; y =

Please show your working out

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book Other Question
Find the equation of the line that passes through points (7,-2) and (5,-1)
Write the equation of the line in slope-intercept form.

I know the the slope intercept for is y = mx +b i am trying to figure out the answer to a question regarding a racing engine were rpm x torque / 5250 = hp . i know the the rpm and the hp but i cannot figure out how to get the t