How to Write an Equation of a Line Given TWO points

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Presentation transcript:

How to Write an Equation of a Line Given TWO points Write down y = mx + b. Use the slope formula to find m. Pick one of the ordered pairs & substitute slope for m and the point (x, y). Solve for b. Substitute m and b into the equation.

Equation of a Line - Given 2 points Example 1: (2, 3) (4, 5) y = mx + b 3 = 1(2) + b b = 1 y = x + 1

Equation of a Line - Given 2 points Example 2: (2, 3) (-4, 15) y = -2x + 7

Equation of a Line - Given 2 points Example 3: (2, 2) (0, 4) y = -x + 4

Equation of a Line - Given 2 points Example 4: (2,3) (1,4) y = -x + 5

Equation of a Line - Given 2 points Example 5: (4,5) (5,2) y = -3x + 17

Equation of a Line - Given 2 points Example 6: (6, – 8) (2, – 8) y = -8