Given that abc is similar to def what is x

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

Aquadratic equation in standard from is written ax^2= bx+c, where a, b and c are real numbers and a is not zero?

1. 2. ∠b and ∠y are right angles. 3.? 4.? which two statements are missing in steps 3 and 4? ∠x ≅ ∠c △abc ~ △zyx by the sas similarity theorem. ∠b ≅ ∠y △abc ~ △zyx by the sas similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem.