What is the slope of (5,10)and (7,18)

Question and answers are in the attached picture. you so much in advance.

Find the solution(s) to the system of equations. select all that apply y=x^2-1 y=2x-2

Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.