Algebra Practice Test 2026 – Complete Exam Preparation

To find the result of evaluating the expression x + y with the values x = -8 and y = -15, you simply add the two values together.

First, take the value of x, which is -8. Then, add the value of y, which is -15, to it:

-8 + (-15)

When you add two negative numbers, you combine their absolute values and keep the negative sign. The absolute values of -8 and -15 are 8 and 15, respectively.

Calculating the sum of the absolute values:

8 + 15 = 23

Since both numbers are negative, the result is -23. Therefore, the evaluation of x + y when x = -8 and y = -15 gives you -23, confirming that the result is accurate.