Please help with the following question.

Abcd is a rectangle. Ab has equation x-2y+2=0 and c is the point (1,4).

1. Find the equations of cd and bc

2. Find the coordinates of the point b.

Any help with this would be greatly appreciated.

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- June 25th 2012, 03:27 AMGjlredLinear functions and lines
Please help with the following question.

Abcd is a rectangle. Ab has equation x-2y+2=0 and c is the point (1,4).

1. Find the equations of cd and bc

2. Find the coordinates of the point b.

Any help with this would be greatly appreciated. - June 25th 2012, 03:46 AMGokuRe: Linear functions and lines
y = 1/2 x + 1

The line cd is parallel to the line Ab so the gradients are equaled:

SO for line cd we have y = 1/2 x + c.. now we substitute (1,4)

4 = 1/2(1)+c --> c= 7/2. --> y = 1/2 x + 7/2...

For line bc the line intersects at a right angle use this property to find the equation.... - June 25th 2012, 04:00 AMGjlredRe: Linear functions and lines
Thank you very much I had a problem with the gradient and clearly it threw the rest of my calcs off.