Question

How do I graph the equation `16x^2+y^2+32x-18y=119` on a TI-84?

Answer 1

This represents an ellipse

Explanation:

No clue about TI 84, but this can be written in a more recognizable form by completing the squares,
`16(x^2 +2x ) +(y^2-18y) =119`
`16(x^2 +2x +1) + (y^2-18y +81) -16-81=119`
`16(x+1)^2 + (y-9)^2 =216` which is an ellipse centered at (-1,9) with semi minor axis =`sqrt(216/16)` and semi major axis = `sqrt(216)`