algebra
posted by lee .
Can someone check my answers please and if Im wrong please explain.
1) graph 4x^2+4y^2=64. what are the domain and range?
domain;all real numbers
range;4<=4<=4
2) graph 4x^2+y^2=9. what are its lines of symmetry?
it has two lines of symmetry, the x axis and the y axis
3) graph 3x^2+12y^2=84. what are the domain and range?
domain; all real numbers
range; {y[y<=sqrt7 or y>= sqrt7}
4) identify the center and intercepts of the conic section. then find the domain and range.
the center of the circle is (0,0)
the x intercepts are (6,0) and (6,0)
the y intercepts are (0,6) and (0,6)
the domain is {x[6<=x<=6}
the range is {y[6<=y<=6}
5) write an equation of a parabola with a vertex at the origin and a directrix at y=5.
y=1/20x^2
6) what are the focus and the directrix of the graph of x=1/24y^2?
focus(6,0)
directrix x=6
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