Solve system of equations using substitution:
1) 2x - y = 16
2y - x = -8

assign two variables and equations. solve.

jack and cameron are playing a game of paper football. by their rules, you can score a 5-point touchdown or a 7-point touchdown. in the game, there have been 13 touchdowns scored for a total of 71 points. how many of these touchdowns were 7-point touchdowns?

Which statement explains how you could use coordinate geometry to prove the opposite sides of a quadrilateral are congruent? a. use the slope formula to prove the slopes of the opposite sides are the same. b. use the slope formula to prove the slopes of the opposite sides are opposite reciprocals. c. use the distance formula to prove the lengths of the opposite sides are the same. d. use the distance formula to prove the midpoints of the opposite sides are the same.