Question

Can someone please help i need to write the equation of the green line

Answer 1

f(x) = ax + b

(0, -4):

f(0) = a•0 + b

f(0) = b ⇒ b = -4

(12, 0):

0 = a•12 + b

0 = 12a - 4

4 = 12a

`a=\frac4{12}=\frac13`

The equation of the green line:

`\underline{\,y=\frac13x-4\,}`

or:
`y=\frac13x-4`

`-\frac13x+y+4=0\\\\\underline{x-3y-12=0}`