[> [> Subject: Re: coordinate geometry: linear equations in two variables
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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
put a in any of the two equations to find b
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