Question

8.Substitute the given values and evaluate each expression.

a) 3x + 5
if x = 5
b) 4y + 4 if y = -2

Answer 1

When x = 5, 3x + 5 is equal to 20. When y = -2, 4y + 4 is equal to -4.

Step-by-step explanation:

a) When x = 5, we substitute the value of x into the expression 3x + 5:

3(5) + 5 = 15 + 5 = 20

Therefore, when x = 5, 3x + 5 equals 20.

b) When y = -2, we substitute the value of y into the expression 4y + 4:

4(-2) + 4 = -8 + 4 = -4

Therefore, when y = -2, 4y + 4 equals -4.

Learn more about Evaluating expressions with given values