Equations of straight lines

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Presentation transcript:

Equations of straight lines The straight Lines Equations of straight lines

Graph the line that has slope 2 and y-intercept = 3.

Graph the line passing through x-intercept at ─2 and has a slope -¾ y x -2

Equation of a straight line y = mx + c m = slope of the line c = y-intercept Example: The equation of a line that has gradient 3 and passes through (0,5) is y = 3x + 5.

Write down the equation of straight line given Gradient ─3 and y-intercept 2. Gradient ─2 and y-intercept 5 Answer: y = ─ 3x + 2 y = ─ 2x + 5

Sketch the lines given the equation. y = - 3x+ 4 When x = 0, y = 4 When x = 1, y = -3(1) + 4 = 1 The line passes through (0,4) And (1,1) (0, 4) (1, 1)