840... it might be wrong but im just trying to help people XD
Y = mx + b
y = -3(x) + b
4 = -3(-1) + b
4 = 3 + b
b = 4 - 3
b = 1
y = -3x + 1.
This problem already gave us the slope and y-intercept, so all that's left to do is plug those two values into slope-intercept form.
Slope-Intercept Form: y = mx + b
---m is the slope
---b is the y-intercept
y = 8/3x + 5
Hope this helps!! :)