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

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. 
6x+2y=12
find intercept
a circle equation x^2+y^2+4x4y1=0 and graph
2)find domain and range f(x)=x^24x5
find vertex of f(x) =x^2+4x21