Re: coordinate geometry: linear equations in two variables -- Mathematics Help

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

Author:
MK (Thankful)

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Date Posted: 13:49:40 08/19/15 Wed
In reply to: Engr. Lawrence peter 's message, "Re: coordinate geometry: linear equations in two variables" on 09:38:03 09/08/12 Sat

>>what is the equation of the line that contains the
>>points with (x,y)coordinates(-3,7) and (5,-1)? I need
>>to know how to do this problem step by step.
> solution
>lets assume that (-3,7) is coordinate 1 i.e x1 is -3
>y1 is 7 and (5,-1) is coordinate 2 i.e x2 is 5 and y2
>is -1
>using d formula
> y-y1/x-x1=y2-y1/x2-x1
>by putting in the values of the coordinate u get
>y-7/x-(-3)= -1-7/5-(-3)
>y-7/x+3 =-8/5+3
>y-7/x+3= -8/8
>y-7/x+3=-1/1
>by cross multiplying you get
>1(y-7)=-1(x+3)
>open the brackets you get
>y-7=-x-3
>collect like terms you get
>y+x=7-3
>y+x=4
>this is your required equatn thank you hope I helped

It definitely helped, sir. THANKS ALOT!

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