Use a table of values to graph the equations

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

You are assembling pieces of an iron gate to complete a fence. the finished gate will look like the one below. in order to assemble the gate it is important to under how the pieces are related. part 1: how are pies 1 and 2 in the archway related? part 2: how are the rectangular sections 5 and 6 in the center of the gate related to each other?

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?