## Algebra: A Combined Approach (4th Edition)

4x + y = 11 2x + 5y = 1 to the first equation minus 4x to both sides 4x + y - 4x = 11 - 4x y = 11 - 4x substitude y = 11 - 4x to the second equation 2x + 5 ( 11 - 4x ) = 1 2x + 55 - 20x = 1 use the distributive property - 18x + 55 = 1 - 18x + 55 - 55 = 1 - 55 minus 55 to both sides - 18x = - 54 divide both sides by - 18 x = 3 substitude x = 3 to the y = 11 - 4x y = 11 - $4\times 3$ y = 11 - 12 y = -1