write an equation for the line containing (1,-11) and (2,-14)

Question

tkhunny · Answer

Have you considered the Two-Point Form?

anonymous · Answer

whats that

anonymous · Answer

like the slope form

anonymous · Answer

yes find the slope

anonymous · Answer

and then apply it to y=mx+b

anonymous · Answer

y=mx+b
y=-3x-8

tkhunny · Answer

Slope-Interecept is NOT directly applicable.  You don't have an intercept.

anonymous · Answer

thats what i thought

anonymous · Answer

cuz its not looking for the slope

tkhunny · Answer

You can USE the slope-intercept form, but you don't KNOW the intercept, so you do have to go about it a little differently.

 (1,-11) and (2,-14)

Find the slope

(-14-(-11))/(2-1) = -3/1 = -1

Slope-Intercept Form

y = -3x + b

Substitute a point and solve for b.  I'll use (1,-11)

-11 = -3(1) + b
-11 = -3 + b
-8 = b

Slope-Intercept Form

y = -3x -8

anonymous · Answer

Thank you so so so so much! I've been waiting for a response for a long time. :)

tkhunny · Answer

Well, you had plenty of responses.  I just finally did the whole problem, since the conversation had wandered around a bit.  Always find hints, no matter the response.