book Maths Puzzle Numerical Ability

the question is this: you are meant to..

write an equation of the line that passes through point (-2,3) and is parallel to the line x-y=4.

how do i write that equation?

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book Other Question

simplify.
square root of 32a with an exponent of 3, b with exponent of 2 and c with no exponent.
please help me to solve this problem.
In New York City, taxis charge $2.50 plus $2.00 per mile for off peak fares. How far can Ralph travel for $17.50(assuming off peak fare)