Why do we subtract the x values and subtract the y values?

Which expression is equivalent to 2x^2+2x-4/2x^2-4x+2

Drag the tiles to the correct boxes to complete the pairs. not all tiles will be used. the heights of the girls in an advanced swimming course are 55, 60, 59, 52, 65, 66, 62, and 65 inches. match the measures of this data with their values.

If f(x)= 3x+6 which of the following is the inverse of f(x)