Answer:
65 2 point questions, 5 4 point questions
Step-by-step explanation:
write a system of equations:
let x be the number of 2 point questions and y be the number of 4 point questions
2x + 4y = 150
x + y = 70 (since there are 70 total questions)
x + y = 70
subtract x from both sides
y = -x + 70
substitute y = -x + 70 into 2x + 4y = 150
2x + 4(-x + 70) = 150
2x - 4x + 280 = 150
-2x = -130
x = 65
substitute x = 65 into x + y = 70
65 + y = 70
subtract 65 from both sides
y = 5
