Question

solve for y

Explanation:

Step1: Sum triangle angles to 180°

$y + 102^\circ + 12^\circ = 180^\circ$

Step2: Calculate sum of known angles

$102^\circ + 12^\circ = 114^\circ$

Step3: Solve for y

$y = 180^\circ - 114^\circ$

Answer:

$66^\circ$