y = 2x + 2.5 is the correct answer.
Slope-intercept form is y = mx + b where "m" equals slope and "b" equals the y-intercept.
The equation for figuring out the slope is
divided by

(-3 - 1) ÷ (1 - 3)
-4 ÷ -2 = 2
So, the slope is 2
The y-intercept is 2.5 because "y" equals zero, "x" equals 2.5 on the line.
So, the y-intercept is 2.5
The answer is y = 2x + 2.5
Please let me know if I am wrong.