The sum of twice a number and 9 is 17

Answer 1

I assume you need to write an equation and solve it for this problem.

If we let the variable, x, represent the unknown number , then we

can write the "sum of twice a number and 9" as: 2x + 9

Then "is 17" can be written as : = 17

The equation would be : 2x + 9 = 17

To solve, use inverse operations:

2x + 9 = 17

2x + 9 - 9 = 17 - 9

2x = 8

2x/2 = 8/2

x = 4

The unknown number is 4.