Assemble the proof by dragging tiles to the statements and reasons

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

Find the length of the following tangent segments to the circles centered at o and o' whose radii are 5 and 3 respectively and the distance between o and o' is 12. what is the tangent segment of cd?

Find the y-intercept and x-intercept for the equation 5x-3y=60 what is the y-intercept