We have the points:
G (3, -3)
H (-5, -1)
J (-4, 3)
K (2, 2)
In order to reflect them across the y-axis, we multiply by -1 the y-component for each point, that is:
G' (3, 3)
H' (-5, 1)
J' (-4, -3)
K (2, -2)
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