Question 153312
{{{y=5x}}} and {{{2x+y=28}}}:


You have y as 5x in the first equation, so substitute 5x for y in the second equation:
{{{2x+(5x)=28}}}


Combine like terms
{{{7x=28}}}


Divide both sides by 7
{{{x=4}}}


Now you know that y is 5x, so to find out y, plug in 4 for x.
{{{y=5(4)}}}


Simplify
{{{y=20}}}


Answer:
x=4
y=20
(4,20)