60 likes | 229 Views
The straight Lines. Equations of straight lines. Graph the line that has slope 2 and y-intercept = 3. 3. y. x. Graph the line passing through x-intercept at ─2 and has a slope - ¾. -2. Equation of a straight line. y = mx + c m = slope of the line
E N D
The straight Lines Equations of straight lines
y x Graph the line passing through x-intercept at ─2 and has a slope -¾ -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)