Evaluate the expression when x = -2 and y = -4

Question

Evaluate the expression when x = -2 and y = -4
-4x + 7y

GPT-4o mini · Answer

To evaluate the expression $-4x + 7y$ when $x = -2$ and $y = -4$, follow these steps: 1. Substitute the values of $x$ and $y$ into the expression: $$ -4(-2) + 7(-4) $$ 2. Calculate $-4(-2)$: $$ -4 \times -2 = 8 $$ 3. Calculate $7(-4)$: $$ 7 \times -4 = -28 $$ 4. Now combine the two results: $$ 8 + (-28) = 8 - 28 = -20 $$ Thus, the value of the expression $-4x + 7y$ when $x = -2$ and $y = -4$ is $\boxed{-20}$.