Posted by zach w on .
perpendicular to line 2x+y=7 contains the point (4,2) the equation of line is

math urgent urgent urgent 
Steve,
2x+y=7 can be written as
y=2x+7, so we see it has slope=2
so, the perpendicular has slope 1/2
now you have a point and a slope:
y+2 = 1/2 (x+4)
and you can massage that as you will. 
math urgent urgent urgent 
zach w,
6x+2y=12
find intercept
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find vertex of f(x) =x^2+4x21