Answer:

Step-by-step explanation:
By definition, the interior angles of a triangle must sum to 180°. Therefore:

Combine like terms:

Subtract 70 from both sides:

And divide both sides by five. Hence:

Next, notice that <em>y</em> and the 57° angle form a linear pair. By definition, linear pairs equal 180°. Therefore:

So:

Alternatively, we can use the Exterior Angle Theorem, which states that the exterior angle is equivalent to the sum of the two interior angles opposite to the exterior angle. In other words:

Since we've determined that <em>x</em> = 22:

We acquire the same answer.