## maddy21 2 years ago slope intercept form the equation of the line passing through the points (2.3) (-4.5)

1. campbell_st

can you find the slope of the line..?

yes

3. campbell_st

ok... so what did you get for the slope...?

|dw:1359752467738:dw|

5. campbell_st

ok... so the slope intercept form of a line is y = mx + b m is the slope and b is the y- intercept simplifying the slope it becomes - 1/3 so you have y = -1/3 x + b pick either point.... and substitute it into the equation to find b. if you choose (2, 3) substitute x = 2 and y = 3 into the equation and solve for b so 3 = -1/3 (2) + b can you do that..?

ill try

7. campbell_st

8. campbell_st

oops... it will be a mixed number... for b

|dw:1359752864385:dw|

hehe i think im wrong

11. campbell_st

ok... so simplified the slope |dw:1359753073245:dw| so what do you think the equation is given the slope is -1/3 and b = 3 2/3

how did u get 1/3?

13. campbell_st

you said the slope is -2/6 which is the same as - 1/3 take out the common factor of 2 so your equation is $y = \frac{-1}{3} x + 3 \frac{2}{3}$