Chapter 8 - Systems of Linear Equations and Problem Solving - 8.1 Systems of Equations in Two Variables - 8.1 Exercise Set - Page 508: 48

31 two pointers and 9 three pointers

We first write the word problem as an equation. Next, we solve the equation using substitution. Doing this, we find: $$ 2x+3y=89, x+y=40 \\ \frac{89-3y}{2}+y=40 \\ y=9 \\ x=\frac{89-3\cdot \:9}{2} \\ x=31$$