SAT Math Multiple Choice Practice Question 39: Answer and Explanation
17. If 2a + 3b = 17 and 2a + b = 3, then a + b =
Correct Answer: B
B. By adding the two expressions, you discover that 4a + 4b = 20, so a + b = 5. You can also solve for the variables to get a = -2 and b = 7, which gives you the same answer.