Does anyone kno this

Select the correct answer from each drop-down menu. a system of equations and its solution are given below. system a complete the sentences to explain what steps were followed to obtain the system of equations below. system b to get system b, the equation in system a was replaced by the sum of that equation and times the equation. the solution to system b the same as the solution to system a.]

Given: circle o, cd is diameter, chord ab || cd. arc ab = 74°, find arc ca.

Yvaries directly as x. y =90 when x=6. find y when x=13