y = 0.5x + 6 makes an angle
arctan 0.5 = 26.57 degrees with the x axis. It slopes upward.
y = -.75x -1 makes and angle arctan -0.75 = -36.87 degrees with the x axis (It slopes downward)
The sum of those two angles is the acute angle between them. 63.44 degrees.
Round it to 63 degrees.
FOR EACH PAIR OF LINES, DETERMINE SIZE OF ACUTE ANGLE, TO THE NEAREST DEGREE, THAT IS CREATED BY INTERSECTION OF LINES.:--Y = 0.5X+6 AND Y=-0.75X-1
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