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

2x +3y = 18 x = 2y - 5 Substitute x for 2y - 5 to the first equation 2 ( 2y - 5 ) + 3y = 18 4y - 10 + 3y = 18 use the distributive property 7y - 10 = 18 simplify 7y - 10 + 10 = 18 + 10 add 10 to both sides 7y = 28 $\frac{7y}{7}$ = $\frac{28}{7}$ divide both sides by 7 y = 4 x = $2\times4$ - 5 substitude y = 4 to the second equation x = 8 - 5 x = 3