Do the points p(1,-3), q(2,1) and r(2.5,3) lie on the same straight line

Find the value of p for which the polynomial 3x^3 -x^2 + px +1 is exactly divisible by x-1, hence factorise the polynomial

Solve -.016x= -16. need solving this

What is the solution to the system of equation graphed belowa.(0,-4)b.(2,5),1),-3)