Please refine the question.
There are an infinite number of values for x between -4 and 4. And each one of those points has a y value associated with it. There is simply too much information requested.
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y / r2 = a constant (k) so k = 405/81 ie 5. k = y/4 when r = 2, so y = 20.
8
y = 36
if you are asking what y equals heres what it is y=54+4 y=58
x=4 y=4