Equation using 2 4 1 that equals 15

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

How do i get my dad to stop making me gargle his pickle i want my mom to gargle my pickle not my dads

When you are making a circle graph by hand, how do you convert a number for a part into its corresponding angle measure in the circle graph? when you are making a circle graph by hand, what should you do if one of your angle measures is greater than 180°?