Daughter preparing for test.

$\displaystyle 4x^2$+$\displaystyle 3y^2$=48

$\displaystyle 3x^2$+$\displaystyle 2y^2$=35

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$\displaystyle -12x^2$+$\displaystyle -9y^2$=-144

$\displaystyle 12x^2$+$\displaystyle +8y^2$=140

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$\displaystyle -y^2$=-4

$\displaystyle y^2$=4

y=+-2

$\displaystyle 4x^2$+$\displaystyle 3(2)^2$=48

$\displaystyle 4x^2$=36

$\displaystyle x^2$=9

x=+-3

(I think I answered the first part of the question while typing it.)

I know I will have a question in a moment