Question

How do you write an equation of the line given (m = -3) and (b = 5)?

Answer 1

I'm assuming `b` is the X-intercept for an equation of the form
`y = m(x-b)`
(and that the Y-intercept is `0`)

Your equation would therefore be
`y = -3(x-5)`
or
`y = 15- 3x`