Answer:
[tex]y = - 0.5x + 5.5[/tex]
Step-by-step explanation:
finding the slope
[tex] \frac{3 - 1}{5 - 15} = - \frac{1}{2} [/tex]
m is the slope
[tex] - 0.5x + b = y[/tex]
we can get y from any point but that goes for x,too
[tex] - 0.5(5) + b = 3 \\ b = 2.5 + 3 \\ b = 5.5[/tex]
the equation is
[tex]y = -0.5x + 5.5[/tex]
