If x = 4, what is the value of y in y = 2x + 5?

If x = 4, what is the value of y in y = 2x + 5?

• A. 13
• B. 8
• C. 14
• D. 10

Answer: (A)

Substitute the given value into the expression. With x = 4, y = 2x + 5 becomes y = 2(4) + 5, which is 8 + 5 = 13. So y equals 13. The other numbers come from altering the constant term or missing it: 8 would be if you only did 2x, 14 would require adding 6 instead of 5, and 10 would come from adding 2 instead of 5. The correct substitution gives the unique result 13.

Substitute the given value into the expression. With x = 4, y = 2x + 5 becomes y = 2(4) + 5, which is 8 + 5 = 13. So y equals 13. The other numbers come from altering the constant term or missing it: 8 would be if you only did 2x, 14 would require adding 6 instead of 5, and 10 would come from adding 2 instead of 5. The correct substitution gives the unique result 13.