it's an ellipse centered at the origin: ezpz
take an x²
look at one of the x-intercepts
square that and slap it under the x²
put a "+" after it.
take a y²
look at one of the y-intercepts
square that and slap it under the y²
Put that all after the "+"
Last, put an "= 1" at the end and BAM!!!
Congratulations! You now have an equation!
[tex]\frac{x^{2} }{25} + \frac{ y^{2} }{9} = 1[/tex]