Okay, so basically our x is the independent value and y is the dependant value.
IT is dependant on what x equals We plug in our x-value such as 1 into an equation and then we get our y-value. SO basically we start off with an x-value and then land up with a y-value
SO for example we have an equation:
y=3x-4 Let x=3 ---> y=3(3)-4=5
So our y-value is 5 WE are doing the same thing with that mapping picture. ON the left hand side is all the x-values and the right hand side is all the y-values once it has been plugged "some" equatio which is unknown to us
Now we know that a paired coordinate has the form (x,y) where the first value in the bracket is the x-coordinate and the second value is the y-coordinate. The paired coordinate basically tells us that when x is this value y is that value
