What is an equation in slope-intercept form for the line that passes through the points (1,-3) and (3,1)?

Question

anonymous · Answer

Do you know this?
$$m=\frac{\triangle y}{\triangle x}=\frac{y_2-y_1}{x_2-x_1}$$

icalibear · Answer

yea

icalibear · Answer

but for the slope i keep getting 1/2 and that doesnt work for my multiple choice options

anonymous · Answer

"m" means slope

y=mx+b is the point slope form

input the slope for m and any of your two coordinates for x & y, solve for b

anonymous · Answer

Then rewrite it with b & m as numbers you found, and leave the x & y as variables.  That's your equation.

icalibear · Answer

the slope is 1/2 right, is that correct?

icalibear · Answer

my choices are 
a. y = 3x + 1
b. y = x - 3
c. 2x + 5
d. 2x - 5

anonymous · Answer

It's this...
$$\frac{rise}{run}$$

Take a look again at the formula I initially posted please

anonymous · Answer

3 below to 1 above is NOT 2...

anonymous · Answer

The triangle symbol, delta, in that formula means in works "the change in"

icalibear · Answer

ok well i did that and got this|dw:1340734061842:dw|