If two angles are vertically opposite (or part of a vertical pair), they are equal in measure. However, if you mean that they are supplementary in this context (which is often the case in word problems dealing with pairs of angles), then we can say:
Let the measure of one angle be \( x \) degrees. Since the two angles add up to 70°, we have:
\[ x + x = 70° \]
This simplifies to:
\[ 2x = 70° \]
To find \( x \), divide both sides by 2:
\[ x = \frac{70°}{2} = 35° \]
So, each angle measures \( 35° \).