The function in which each y-value has only one corresponding x-value is called a one-to-one function so the option
A certain kind of relationship called a function binds inputs to essentially one output.
A function can be regarded as a computer, which gives output values related to the nature of the function.
In other words, the function is a relationship between variables, and the nature of the relationship defines the function for example y = sinx and y = x +6 like that.
Let a function
f(x) = x²
Here for f(x) = 1
x² = 1 ⇒ x = +1 , -1
So you have two values of x corresponding to y so it is not a one-to-one function.
Let a another example f(x) = 2x + 3
For f(x) = 1
2x + 3 = 1 ⇒ x = -1
So it has only one value so it will be one to one function.
Hence, it is clear that a function that has one value corresponding to one x value then that function is called a one-to-one function.
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