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Subject: Re: coordinate geometry: linear equations in two variables


Author:
QUITTNER
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Date Posted: 07:17:31 06/20/05 Mon
In reply to: Misty Bowman 's message, "coordinate geometry: linear equations in two variables" on 18:06:25 06/18/05 Sat

>>> what is the equation of the line that contains the points with (x,y)coordinates(-3,7) and (5,-1)? <<<
..... The equation of a straight line is y=ax+b. Just insert the given values into the two simultaneous equations, and solve them for a and for b.
7=(-3)a + b
(-1)= 5a + b

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[> [> Subject: Re: coordinate geometry: linear equations in two variables


Author:
kanishkporwal
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Date Posted: 00:44:59 09/15/11 Thu

>>>> what is the equation of the line that contains the
>points with (x,y)coordinates(-3,7) and (5,-1)? <<<
>..... The equation of a straight line is y=ax+b. Just
>insert the given values into the two simultaneous
>equations, and solve them for a and for b.
> 7=(-3)a + b
>(-1)= 5a + b
now you just need to solve these two linear equations
for solving linear equations you just need to
subtract eq 2 from eq 1 to get
8=(-8)a
a=-1
put a in any of the two equations to find b

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