If Michael has $2 and he spends $1, how much money does he have left? We can figure this out by subtracting $1 from $2. This is obviously equal to $1.
We can use the same idea for this problem. George starts with $23 and spends at least $14. After this, George has 23 - 14 = $9 dollars left. So, George can spend $9 at the max.
We can translate this into math words by saying George can spend less than 9 on glue, so p < 9. So, a. is the correct answer.
In perpendicular lines, the slopes are opposite reciprocal. This means you flip the sign (from + to - or from - to +) and flip the numerator and denominator.
