Givens
2 crossed straight lines, each with a measure of 180 degrees total
2 vertically opposite angles.
Problem
Prove x = 45
Proof
2x + 6 = 96 Vertical Angles are equal
2x + 6 - 6 = 96 - 6 Subracting equals from both sides of an equation does not destroy equality. When I learned this, we said e f e are e. "equals from equals are equal." It's a chant.
2x = 90 On the left it is the additive inverse is added to a number, the result is 0,
2x/2 = 90/2 Equality is not destroyed if both sides are divided by the same thing.
x = 45 QED
