After a snowstorm, Mandy and Jack decided to help out their neighbors by shoveling the driveways in their neighborhood. Mandy shoveled two times as many driveways than Jack. Together they shoveled a total of 57 driveways. How many driveways did each of them shovel? You must use the substitution method to solve this system of equations.
Equation 1:_________
Equation 2:_________
