Question

Solve the system of equations by substitution.
x+y=20
y=4x

The solution of the system is
​(Simplify your answer. Type an ordered​ pair.)
Answer
y=-3x+27
2y-x+9=0

The solution is

  ​(Simplify your answer. Type integers or simplified fractions. Type an ordered​ pair.)
Answer
4x+4y=-24
-3x+y=26

What is the solution of the ​system?
​(Type an ordered​ pair.)

Answer
3x-9y=1
9y=x-1
The solution is
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