Can someone show me the steps for solving. i had but i'm confused.

The sum of angles in any triangle is 180°  So the missing angle in the bottom triangle is:

180-76-54=50°

Now that right angle (the square) is bisected by this 50° so the bottom angle of the inverted upper triangle is 90-50=40°

And again, because the sum of angles in a triangle is always 180°.  The missing angle in the inverted triangle the "?" is:

180-70-40=70°

So "?"=70°

Y=3x+1 so the first one

Logical equivalent of the give question is its contrapositive