What is the 4 letter name for the vertical distance? *

Can someone show me the steps to solve the problem?

(05.08a)triangle abc is transformed to similar triangle a′b′c′ below: a coordinate plane is shown. triangle abc has vertices a at 2 comma 6, b at 2 comma 4, and c at 4 comma 4. triangle a prime b prime c prime has vertices a prime at 1 comma 3, b prime at 1 comma 2, and c prime at 2 comma 2. what is the scale factor of dilation? 1 over 2 1 over 3 1 over 4 1 over 5

Hardest math question of all time can you solve the equation. check for extraneous solutions.9∣9-8x∣ = 2x+3