Express Y coordiante

• Apr 10th 2010, 05:19 AM
Express Y coordiante
Hello
Help with the question on my drawing please?
its a rectangle in isoceles right triangle
• Apr 10th 2010, 05:47 AM
Quote:

Hello
Help with the question on my drawing please?
its a rectangle in isoceles right triangle

If the triangles are isosceles and right-angled, then B is the point \$\displaystyle (0,1)\$. So the equation of AB is
\$\displaystyle x+y=1\$
So, making \$\displaystyle y\$ the subject:
\$\displaystyle y = 1-x\$
which gives the value of \$\displaystyle y\$ at the point P.

• Apr 10th 2010, 06:21 AM
Thanks
I got that but I was no sure if it was correct

but I done it this way y-y1=m(x-x1)
1-x=0(1-x)
would it be correct to write it like this also?
• Apr 10th 2010, 07:43 AM
Quote:

Thanks
I got that but I was no sure if it was correct

but I done it this way y-y1=m(x-x1)

You can certainly use
\$\displaystyle y-y_1=m(x-x_1)\$
to get the equation of the line. Using
\$\displaystyle x_1=1,\;y_1=0\$ and \$\displaystyle m = -1\$
gives
\$\displaystyle y-0=-1(x-1)\$

\$\displaystyle \Rightarrow y = 1-x\$
But this line doesn't make sense, and is not correct:
Quote: