9. For the points A(5,0) and B(7,3), calculate the angle between AB
and the x-axis.

Trigonometry question: For the point A (5; 0) and B (7;3) calculate the angle between AB and the x-axis. The answer given in the book is as follows:56.3 degrees.

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value