It is known that y is positively proportional to the square of X, and when x = 1, y = 2, find the functional relationship between Y and X, and find out the value of y when x = - 3
Y=kX^2
2=k*1^2
k=2
Y=2X^2
When x = - 3, y = 2 * (- 3) ^ 2 = 18
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