Vince successfully solved the system of equations
-5x +y = -21 and y = x - 1. Which of these statements could correctly
describe what he did?

You need to put the answer choices, but I'm guessing it would be something like substitution or Gaussian elimination.

circle area = pi * radius^2

if diameter = 10 then radius = 5

circle area = pi * 5^2

circle area = pi * 25

circle area = 78.5398163397 square units

step-by-step explanation:

alright well the answers to your question is

2xy/9 hope this have a nice day : )

step-by-step explanation: