What is y when x = -3 for y = 2x + 7?

• A. -7
• B. 1
• C. 7
• D. -1

Answer: (B)

Evaluating a linear expression by substitution. To find y when y = 2x + 7 and x is -3, substitute -3 for x and perform the arithmetic: 2x becomes 2(-3) = -6, then add 7 to get -6 + 7 = 1. So y equals 1. This demonstrates how the expression responds to the given x value when you follow the order of operations (multiply then add). The other possible results would come from altering the arithmetic steps, but with the proper substitution you get 1.