Book Maths Puzzle Algebra

Are these linear equations?

y=-4

3=2x+y

*y=1/4xsquared

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Book Other Question

having trouble converting the following story problem into Cramer's Rule (Linear Equation): Drivers A & B depart from the same origin & after 3 hours are 354 miles apart. If they How to divide by Binomials? I need a tecnique on how to solve?
The problem is 2x^2-3x-5 divided by x-3
Thanks