Answer:
x = 12
y = 60
Step-by-step explanation:
Remark
What you are given is a parallelogram. These figures have opposite sides equal and parallel. Parallelograms also have angles opposite each other equal. Put into simpler language
Equations
y = 60 Opposite angles are equal
x + 3 = 15 Opposite sides are equal.
Solution
y = 60 (see the remark)
x + 3 = 15 Subtract 3 from both sides
x = 15 - 3
x = 12
