Ihave no idea how to do this: slope= -3, y-intercept= -1 its slope-intercept form
slope= -2, y-intercept= -4
through: (-3,2) , slope=-1/3
through: (3,2) and (0,-5)
x-5y-5=0

Slope-intercept form is , where  is the slope and is the y-intercept.

Slope = -3, y-intercept = -1

Plug in what we know:





Slope = -2, y-intercept = -4

Plug in what we know:





Through: (-3,2) , slope=-1/3

Okay, here we use point-slope form, and the simplify to get it in slope-intercept form.



Where is the y-value of the point, is the x-value of the point, and is the slope.

Plug in what we know:



Distribute -1/3 into the parenthesis:



Add 2 to both sides:



Through: (3,2) and (0,-5)

Now we plug this into the slope-formula to find the slope, plug the slope and one of these points into point-slope form, then simplify to get it in slope-intercept form.



(3, 2), (0, -5)
x1 y1 x2  y2

Plug in what we know:



Subtract:





Plug this into point-slope form along with any point.





Distribute 7/3 into the parenthesis:



Add 2 to both sides:



x-5y-5=0

Add 5 to both sides:



Subtract 'x' to both sides:



Divide -5 to both sides:

If you need an equation, it would be y=2x+8, y would be how long it grew, x being weeks.if you need how long he was asleep, it would be 4 weeks if he started with no beard, the equation would be x=8÷2if he did have a beard before hand, the equation would be 2w+x=8