## Introductory Algebra for College Students (7th Edition)

y-7=0 y-7+7=0+7 y=7 There is no x in this equation therefore the solution must have y equal to 7. Plug this value for y into the other equation to find x. 7x-3y=0 7x-3(7)=0 7x-21=0 7x-21+21=0+21 7x=21 x=$\frac{21}{7}$ x=3 Therefore the solution is {(3,7)}