Help me please math with an answer asap

Question

LA and LB are vertical angles. If m/ A = (2x + 19)° and m/B = (3x - 18)°.

then find the measure of LA.

Answer 1

Vertical angles are congruent, so have equal measures.

You are given algebraic expressions that represent the measures of a pair of vertical angles, so those algebraic expressions must be equal.

3x-18=2x+19

Solve for x, then substitute that value into one of the algebraic expressions to find the measure of either vertical angle.