Write the slope-intercept equation for the line that passes through (2, -2) and (-1, 10)
please show work!

Question

anonymous · Answer

i don't understand what to do

anonymous · Answer

y=-4x+(10/4)

anonymous · Answer

how did you get y=-4

anonymous · Answer

to find m. which is slope of the form Y=MX+B
$$m=\frac{y _{2}-y _{1}}{x _{2}-x _{1}}$$

anonymous · Answer

over three, down twelve same as over one down 4

anonymous · Answer

$$m=\frac{10-(-2)}{-1-2}$$
$$m=\frac{12}{-3}$$
$$m=-4$$

anonymous · Answer

now to find b. Just plug into the equation
$$y=-4x+b$$ the x and y and solve for b

anonymous · Answer

from -1 to 2 is three steps to the right on horizontally.  from 10 to -2 is twelve steps down.  over 3 down 12.  same as over 1, down 4.  that explains the  -4 as the slope.  
(- because down)

amistre64 · Answer

i tend to get my xs and ys misplaced so I perfer stacking and subtracting ....

   (2, -2)
-(-1, 10)
---------
    3,-12; slope = y/x = -12/3 = -4

amistre64 · Answer

y = -4x -(-4.2) -2

y = -4x +8-2

y = -4x +6

anonymous · Answer

keebler you got this?

anonymous · Answer

yes