Please help this is timed (I got an answer but i don’t know if it’s right. If not, can someone tell me?)

What is the missing step in this proof ?

Type the correct answer in the box. consider the system of linear equations below. rewrite one of the two equations above in the form ax + by = c, where a, b, and c are constants, so that the sum of the new equation and the unchanged equation from the original system results in an equation in one variable.

Which graph has figures that can undergo a similarity transformation to justify that they are similar? (obviously not the third one)