Question 259387
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{{{4x + 5y + z = 20}}}?

The y-coordinate of the y-intercept of a plane is what you get 
when you substitute 0 for the other two letters and solve for y.

{{{4(0)+5y+(0)=20}}}
{{{0+5y+0=20}}}
{{{5y=20}}}
{{{y=4}}}

So the y-intercept is the point (x,y,z) = (0,4,0)

Edwin</pre>