]how would you simplify (square root of 66)?
simplify it like this:
(square root of 80):
in the square root thing: (2 * 2 * 2 * 2 * 5)
* *

66= 2* 3* 11

Because there is no repeated factor of 66, you cannot simplify . It is already in its simplest form.

Hope this helps~

First find slope(m):
y1-y2 -5-3 -8 -8
= = =
x1-x2 4-(-1) 4+1 5

m= -8/5

Then use intercept form:
y1-y2=m(x1-x2)

Plug in slope and one of the given points:
y-3= -8/5(x-(-1))
y-3= -8/5(x+1)
y-3= (-8/5)x-8/5
y= (-8/5)x+7/5

y=(-8/5)x+7/5

Check:

y=(-8/5)(-1)+7/5
y=8/5+7/5
y= 15/5
y=3
yes

y=(-8/5)(4)+7/5
y= -32/5 + 7/5
y= -25/5
y= -5
yes