Question

Find the value of x please.

choices are..
16
19
18
15

Answer 1

x = 19

Explanation:

Angle on a straight line add up to 180

123 + 3x = 180

3x = 180 - 123

3x = 57

3x/3 = 57/3

x = 19

Answer 2

We have supplementary angles.

123 + 3x = 180

3x = 57

x = 19