Question

Calculate the value of x

Answer 1

55°

Explanation:

since angles in a straight line add up to 180°

x+2x+15=180°

3x+15=180°

3x=180-15

3x=165

divide by 3 on both sides

x=55°

Answer 2

x = 55

Explanation:

x + (2x+15) = 180

3x + 15 = 180

3x = 165

x = 55