Question 924870
5x+y=19 and 
<u>-5(x-3y=7)</u>
16y = -26
y = -16/16 
y = -1
x = 4 {{{5x = 19-y}}}, {{{x = 20/5}}}
and...checking
x-3y=7  Yes  {{{4-3(-1) = 7}}}
............
x+ y = 4 + (-1) = 3
x + y = 3