X+(6+2x)=90 that's as far as i got​

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

Look at arnold's attempt to solve the equation for b: 3b = 12 b = 3 · 12 b = 36 describe the mistake that arnold made.

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?