#### 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)}

Published by
Pearson

ISBN 10:
0-13417-805-X

ISBN 13:
978-0-13417-805-9

{(1,3)}

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