2. 4x + 2y = 18 a. (1,8)4 + 16 = 18 a. 4(1) + 2(8) = 18 b. (3,3)20 = 18 b. 4(3) + 2(3) = 18 12 + 6 = 18 18 = 18 15x + 5y = 5 a. (-2,7) NoYes b. (-1,4) a. 15(-2) + 5(7) = 5b. 15(-1) + 5(4) = 5 -30 + 35 = 5-15 + 20 = 5 5 = 5 Yes

3. y = 2x + 10 x y 1y = 2(1) + 1012 0y = 2(0) + 1010 y = 2(-1) + 108 (1,12) (0,10) (-1,8) y = -x + 5 x y 1y = -1(1) + 54 0y = -1(0) + 55 y = -1(-1) + 56 (1,4) (0,5) (-1,6)

4. 4x + 2y = 20 -4x 2y = -4x +20 22 y = -2x +10 5x + y = -5 -5x y = -5x - 5

5. y = 4x - 1 x y y = 4(-1) - 1-5 0y = 4(0) - 1 1y = 4(1) - 13 y = -3x + 1 x y y = -3(-1) + 14 0y = -3(0) + 11 1y = -3(1) + 1-2