Section+7.2+(continued)

Section 7.2 (continued)

*Sometimes we have to do some work to get a variable by itself**

Ex: 2x+y=8 ––> y=2x+8 Ex:  2x+3y=10 -2x -2x | | 4x+2y=12 | | 2y=12-4x 4x-3y=6 <––––– | **y=6-2x** | 2x+3(-2x+6)=10 4x-3(-2x+8)=6 | 2x-6x+18=10 4x+6x-24=6 |  –18 –18 10x-24=6 | -4x= –8 10x=30 | **//x=2//** y=6-2(2) y=-2(8)+8 **//y=2//** (**3,2)** ** (2,2) **
 * //x=3//** –––––––––––––
 * //y=2 //**