Answer:
y = -3x+18
Step-by-step explanation:
We can find the slope using the formula
m = ( y2-y1)/(x2-x1) where *x1,y1) and (x2,y2) are two points on the line.
( 1,15) and (5,3) are two points on the line.
m = ( 3-15)/(5-1)
m = -12/4
= -3
The slope is negative.
Using the equation for a line.
y = mx+b
y = -3x+b
Substituting a point into the equation.
15 = -3(1) + b
18 = b
y = -3x+18
