What can you multiply to give you -42 and add up to 1

Which values for a and b will create infinitely many solutions for this system of equations? ax-y=8 2x+y=b

Adj has a total of 1075 dance and rock songs on her system. the dance selection is 4 times the size of the rock selection. write a system of equations to represent the situation.

Is the power produced directly proportional to the wind speed, give reasons for your answer?