Question

What is the equation of a line through the points (0, 9) and (3, 0)?

Answer 1

First you'll use the slop formula to find the slope.

Slope =
`(y2-y1)/(x2-x1)`
Slope =
`(0-9)/(3-0)`
Slope =
`(-9)/(3)`
Slope =
`{-3}`

Now we write the equation.

y = mx + b
y = -3x + 9

In this equation -3 is the slope and 9 is the y-intercept.

Hope this helps :)