For two points, take the y coordinate of the second one (in some arbitrary order) and subtract the y coordinate of the first one. Its possible they want the answer to be positive, so if its negative multiply by -1.
A bit more context would help though...
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The difference in the y-values of two points on a line is equal to the vertical distance between those points. This difference is also known as the "rise" or the "change in y." To calculate the difference in the y-values of two points (y₁, x₁) and (y₂, x₂) on a line, you simply subtract the y-coordinate of one point from the y-coordinate of the other: Difference in y-values = y₂ - y₁ This calculation gives you the vertical distance between the two points on the line.
subtracting
The first and second coordinate. X is the first coordinate and y is the second.
A line is just a line, but the y-coordinate (the point where the line intersects the y-axis) is termed the y intercept. This point has an x coordinate that is always zero and the y coordinate can be positive, zero, or negative
the x coordinate is always before the y coordinate just like in the alphabet