## Equation Of A Straight line?

Simplificatation, evaluation, linear equations, linear graphs, linear inequalities, basic word problems, etc.
Dockers_Girl
Posts: 2
Joined: Sat Feb 26, 2011 11:10 am
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### Equation Of A Straight line?

Sorry about my last post, i put the working out for a differnt question and i dont know how to delete the question.
This is the real working out..

Find the equation of the following straight line
through (0,-1) and ( 2, -9)

-9-1 / 2-0 = -10/2

y=10/2x + c

x = 0 y = -1

-1 = -10/2 (0) + c

giving c = -1

my answer y = -10/2x - 1

but the answer is y = -4x - 1

What am i doing wrong?

Martingale
Posts: 333
Joined: Mon Mar 30, 2009 1:30 pm
Location: USA
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### Re: Equation Of A Straight line?

Sorry about my last post, i put the working out for a differnt question and i dont know how to delete the question.
This is the real working out..

Find the equation of the following straight line
through (0,-1) and ( 2, -9)

-9-1 / 2-0 = -10/2
$\frac{-9-(-1)}{2-0}=\frac{-8}{2}=-4$