Explanation
\(\text { Slope }=\frac{Y_{1}-Y_{2}}{X_{1}-X_{2}}\) In this case \(Y_{1}=4, Y_{2}=3, X_{1}=5, X_{2}=0\) \(\frac{4-3}{5-0}=\frac{1}{5}\)
Simplify \(\frac {5}{10}\)
Simplify \(\frac{90}{105}\)
How many different passcodes can be formed from the letters {A, B, C, D} if each letter can only be used once?