Question

What is the equation of a line that passes through the points (4,8) and has a slope of -3

Answer 1

Equation of a line: y = Mx + c

Slope = 3; therefore, m = 3. Put that into the equation.

y = 3x + c

Substitute the given point to find c.

(4,8)

x = 4, y = 8

8 = 3(4) + c

8 = 12 + c

8 - 12 = c

-4 = c

Substitute c into the original equation.

y = 3x - 4