To determine which of the given points is a solution to the equation \(1.5x - 2y = 8\), we will substitute each point into the equation and see if it satisfies it.
-
Mary believes (4, -7): \[ 1.5(4) - 2(-7) = 6 + 14 = 20 \quad \text{(not a solution)} \]
-
Peter believes (-4, 7): \[ 1.5(-4) - 2(7) = -6 - 14 = -20 \quad \text{(not a solution)} \]
-
Sam believes (-4, -7): \[ 1.5(-4) - 2(-7) = -6 + 14 = 8 \quad \text{(is a solution)} \]
-
Fiona believes (4, 7): \[ 1.5(4) - 2(7) = 6 - 14 = -8 \quad \text{(not a solution)} \]
The only point that satisfies the equation \(1.5x - 2y = 8\) is Sam's belief: \((-4, -7)\).
Answer: Sam believes (-4, -7) is a solution.