Solve the following system of equations for z and for y: System of Equations: y=9+3z y = 51 - 3z Value of z Value of y Solve the following system of equations for a and for b: System of Equations: 4a+2b = 20 15a5b60 Value of a Value of b Plot the following system of equations on the following graph. System of Equations: p = 6-2q p = 4+q Note: Use the orange line (square symbols) to plot the first equation, and use the blue line (circle symbols) to plot the second equation