Question

Which is NOT a function?
O x+y=3²
O y=x+3²
O y=r²-3
O r+3=y²

Answer 1

r+3=y2

Explanation:

The expression that is NOT a function is ( r + 3 = y^2 ). In a function, each input (in this case, ( r )) should correspond to a unique output (in this case, ( y )). However, the expression ( r + 3 = y^2 ) represents a relation where one ( r ) value could have multiple corresponding ( y ) values, violating the definition of a function.