A Question for MathBuster Forum

[amiira awoow]

Determine the point on the graph of the equation 2x+5y=20 whose x-coordinate is5/2 times its y-coordinate 

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[amiira awoow]

Construct an equilateral triangle given its side equal to 4 cm

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[Dr. Atul Nischal]

Hi Amiira

Suppose the required point is (a, b). Then we are given that a = (5/2)*b. 

Now, if you put x = (5/2)*b and y = b in the equation 2x+5y=20, you will get a linear equation in one variable "b". You can solve this to find the value of 'b'. Then, you can multiply that by 5/2 to find the value of 'a'. 

This will give you the required point.

Hope its clear.

[soum...@yahoo.in]

(straight lines) when we convert an equation from the standard form to the normal form, why don't we use the -ve sign on the numerator of each coefficient? The formula for A, B and C has it.

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