Answer
{(1,3)}
Work Step by Step
y=3x
Plug this value of y into the other equation.
x+y=4
x+(3x)=4
4x=4
x=$\frac{4}{4}$
x=1
Now plug this back into the first equation to find y.
y=3(1)
y=3
Therefore the solution set is {(1,3)}
Introductory Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-805-X
ISBN 13:
978-0-13417-805-9
Chapter 4 - Section 4.2 - Solving Systems of Linear Equations by the Substitution Method - Exercise Set - Page 300: 1
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