Slope is 4, and (5,2) is on the line.

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

Explain why the factor 1.5 is broke. into two numbers in the model.

How many different three-digit numbers can be formed using the digits 1 comma 2 comma 9 comma 6 comma 4 comma 3 comma and 8 without repetition? for example, 664 is not allowed.