algebra
posted by Marissa .
1)What is the 4x^2=y^2+8y+32
answer= either hyperbola or parabola
2)The graph of which equation is a circle?
answer= 5x^2+10x+5y=9
3)Solve the system of equations by graphing x^2+y^2=16 and y= x+4
answer= (4,0),(0,4)
4)Find the exact solutions of each system of equations x^2+y^2=25 and 9y=4x^2
answer= (3,0),(3,4)
5)Find the exact solutions of each system of equations y=x^2+1 and y=2x
answer= (1,2)
#1 is a hyperbola.
The ?x^2  ?y^2 .... is the clue.
#2 your answer of
5x^2+10x+5y=9 is a parabola
#3
solutions are (4.0) and (0,4)
use substitition
x^2 + (x+4)^2 = 16
etc
#4
I got (3,4) and (3,4), they work in both equations, yours dont.
I multiplied the circle equation by 4 to get
4x^2 + 4y^2 = 100, then replaced 4x^2=9 into that, etc
#5
yes
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