All Junior Cert Mathematics posts
• #### does anyone know 2nd year co ordinate geometry???? Sarah2014

i do not understand what equation formula to use and when to use it. How do you draw a line??

thanks

1. #### MakeupGirl

try this website https://www.khanacademy.org/ - they explain alot for geometry

2. #### EvieMickey

I do :) we just finished this chapter and I achieved 100% in the test:) its really easy.

If they want you to find the 'equation if a line' they will give you one line (ex.line p) and a point on that line (ex.(4,7).All you have to do to find the equation if a line is to first find the SLOPE of line P using the y=MX+c formula and then when you found the slope you have to use the EQUATION OF A LINE formula using the two coordinates (4,7) and your new found slope :)

3. #### EvieMickey

Its really easy to draw a line.They will give you coordinates example: A(4,6) andB(6,1)

Now you plot them.For line A go to 4 on the x-axis and 6 on the y-axis.Now using your ruler join the two points together to get line A :)

The same goes for Line B :)

4. #### Sarah2014

thank you so much @makeupgirl and @eviemickey but just when do i know what formula to use

like

y=mx+c

or

y-y1=m(x-x1)

5. #### Me

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