Looking at the picture, the 112-degree angle is supplementary (180 degrees total) to the 2y angle. As a result, we can form the equation: 112 + 2y = 180.
112 + 2y = 180
<em>First, subtract 112 from both sides.</em>
2y = 180 - 112
2y = 68
<em>Then divide both sides by 2.</em>
y = 68/2
y = 34
Bonus:
x + 18 is vertical to 112, so the equation x + 18 = 112 will be used.