Question

What is the solution to the system of equations? Use the substitution method.
y-3x=7
21+9x=3y
A. There is no solution
B. There are an infinite number solutions
C. The solution is {1,10}
D. The solution is {28,0}

Answer 1

THE solution is D.


you have 7 and 3 so commom multiple is 21
y-3*7=7

y-21=7

y=21+7

y=28