Book Maths Puzzle Time Distance and Speed

How do I go about solving this question...2 riders, Jeff and Nancy, are 25 miles apart, riding towards each other at 15 mph (Jeff) and 10 mph (nancy). A fly starts from Jeff and fl

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I am learning to dividing polynomials and I understand the synthetic division on easy one but, then if you put one like 4x + 4x -13x +5 * (2x+5)= ?

which number do I divide by How do you solve for y in each of these equations . Giving 3 solutions to each equation.

x-y= -5

-2x+y=7

3x-4y=12

-5x+3y=-15