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Which of these points are on the line y = 3x – 4 ? (3, 5)		(5, 10)		(-2, -10) y = 3x – 4    5 = 3(3) – 4   5 = 9 – 4    5 = 5   (3, 5) is  on the line y = 3x – 4   10 = 3(5) – 4  10 = 15 – 4  10 ≠ 11  (5, 10) is not   on the line y = 3x – 4   -10 = 3(-2) – 4  -10 = -6 – 4  -10 = -10  (-2, -10) is    on the line
Solve the system of equations:   y = x + 5 					   y = -2x + 2 Solution: (-1, 4) y = x + 5 Slope =    y-int = 1 5 y = -2x + 2 Slope =    y-int = -2 2
Solve the system of equations:   y = x + 5 					   y = -2x + 2 Solution: (-1, 4) Check: y = x + 5 4 = -1 + 5 4 = 4 y = -2x + 2 4 = -2(-1) + 2 4 = 2 + 2 4 = 4
Solve the system of equations:   y = 2x + 2 					   y = 3x + 5 Solution: (-3, -4) y = 2x + 2 Slope =    y-int = 2 2 y = 3x + 5 Slope =    y-int = 3 5
Solve the system of equations:   y = 2x + 2 					   y = 3x + 5 Solution: (-3, -4) Check: y = 2x + 2 -4 = 2(-3) + 2 -4 = -6 + 2 -4 = -4 y = 3x + 5 -4 = 3(-3) + 5 -4 = -9 + 5 -4 = -4
Solve the system of equations:   2x + 3y = 12 					   2x + y = 8 Solution: (3, 2) 2x + 3y = 12 x 0 6 y 4 0 y-int x-int 2x + y = 8 x 0 4 y 8 0 y-int x-int
Solve the system of equations:   2x + 3y = 12 					   2x + y = 8 Solution: (3, 2) Check: 2x + 3y = 12 2(3) + 3(2) = 12 6 + 6 = 12 12 = 12 2x + y = 8 2(3) + 2 = 8 6 + 2 = 8 8 = 8

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Alg1 lesson 7-1

  • 1. Which of these points are on the line y = 3x – 4 ? (3, 5) (5, 10) (-2, -10) y = 3x – 4 5 = 3(3) – 4 5 = 9 – 4 5 = 5 (3, 5) is on the line y = 3x – 4 10 = 3(5) – 4 10 = 15 – 4 10 ≠ 11 (5, 10) is not on the line y = 3x – 4 -10 = 3(-2) – 4 -10 = -6 – 4 -10 = -10 (-2, -10) is on the line
  • 2. Solve the system of equations: y = x + 5 y = -2x + 2 Solution: (-1, 4) y = x + 5 Slope = y-int = 1 5 y = -2x + 2 Slope = y-int = -2 2
  • 3. Solve the system of equations: y = x + 5 y = -2x + 2 Solution: (-1, 4) Check: y = x + 5 4 = -1 + 5 4 = 4 y = -2x + 2 4 = -2(-1) + 2 4 = 2 + 2 4 = 4
  • 4. Solve the system of equations: y = 2x + 2 y = 3x + 5 Solution: (-3, -4) y = 2x + 2 Slope = y-int = 2 2 y = 3x + 5 Slope = y-int = 3 5
  • 5. Solve the system of equations: y = 2x + 2 y = 3x + 5 Solution: (-3, -4) Check: y = 2x + 2 -4 = 2(-3) + 2 -4 = -6 + 2 -4 = -4 y = 3x + 5 -4 = 3(-3) + 5 -4 = -9 + 5 -4 = -4
  • 6. Solve the system of equations: 2x + 3y = 12 2x + y = 8 Solution: (3, 2) 2x + 3y = 12 x 0 6 y 4 0 y-int x-int 2x + y = 8 x 0 4 y 8 0 y-int x-int
  • 7. Solve the system of equations: 2x + 3y = 12 2x + y = 8 Solution: (3, 2) Check: 2x + 3y = 12 2(3) + 3(2) = 12 6 + 6 = 12 12 = 12 2x + y = 8 2(3) + 2 = 8 6 + 2 = 8 8 = 8