Hi,

(1/3)y^2 + 12 = 5x

substituting x = 3

(1/3)y^2 + 12 = 15

Multiplying each side of the equation by 3

y^2 +36 = 45

y^2 = 9

y = 3

checking our answer

9/3 + 12 = 3 + 12 = 15 = 5*3 

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