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

x-4=0 x-4+4=0+4 x=4 There is no y in this equation, therefore x must equal 4. Plug this value for x into the other equation to find y. 9x-2y=0 9(4)-2y=0 36-2y=0 36-36-2y=-36 -2y=-36 y=$\frac{-36}{-2}$ y=18 Therefore the solution is {(4,18)}