It might have been possible to give an answer if there had been an equation with the question!
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A function is an equation (a relation) which has only one y-value for every x-value. If a single x-value has more than one y-value, the equation is no longer called a function.
If you mean: x+y = 30 and the value of y is 15 then the value of x is also 15
300
If you mean: y = 3x+1 then the value of y will equal 10
You are basically looking for an equation with an x and y value where when 4 is set as x, y would equal 7. An equation of this is: 3 + x = y when x = 4, then y = 3 + 4 = 7