No, I was educated by starlings.
Maths Help
- Thread starter Jamesdavid3
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No, I was educated by starlings.
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Ok, im guessing no1 can tell me, ill go ask in lesson when im back.
Come on guys, I'm sure one of you can help him out.
I would help you myself, but I've got a poor memory so I can't
From a crude plotting of the lines in excel I think I get A to be the point (3,2)...not sure on the accuracy though. Might want to plot them yourself or work it out algebraically.
Edit: I plotted the graph wrong.
Last edited:
well number 1 is fairly straight forward. plot the graph and work it out.
2) using said graph, plot the coordinates and then join them up and answer the question.. you've even explained what it means using the brackets!
we're not doing your homework for you
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So far i have got to..
2x+5y=12 is in another way y= (-2/5)x +12/5 so the slope of this line is -2/5.
If this line is perpendicular to line (AB) then, the slope of (AB) is 5/2.
the equation of line (AB) is: Y - Yb = slope (X - Xb) because B is a point of the line
thus y - 3 = 5/2(x - 5)
and if A is a point of x= -3 then it's x-coordinate is -3
let's find its y-coordinate by replacing its x-coordinate in the equation of (AB)
y - 3 = 5/2(-3 -5) which gives you y= -17
and A(-3; -17)
But i was told theres algebra errors in the first part, but its close..
2x+5y=12 is in another way y= (-2/5)x +12/5 so the slope of this line is -2/5.
If this line is perpendicular to line (AB) then, the slope of (AB) is 5/2.
the equation of line (AB) is: Y - Yb = slope (X - Xb) because B is a point of the line
thus y - 3 = 5/2(x - 5)
and if A is a point of x= -3 then it's x-coordinate is -3
let's find its y-coordinate by replacing its x-coordinate in the equation of (AB)
y - 3 = 5/2(-3 -5) which gives you y= -17
and A(-3; -17)
But i was told theres algebra errors in the first part, but its close..
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- 20 Dec 2008
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i think the answer is 17 anyway, cheers