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To find the y-coordinate of the parabola when x=-3, we substitute -3 for x in the quadratic equation:
y = 5x^2 + 8x + 9
y = 5(-3)^2 + 8(-3) + 9
y = 5(9) - 24 + 9
y = 45 - 24 + 9
y = 30
Therefore, the y-coordinate of the parabola when x = -3 is 30.