Answer:
The equation that can be used to find the number of trucks t sold last year is: t=(c-39,000)/3.
Explanation:
From the information given, you know that the number of cars sold was 39,000 more than three times the number of trucks, which could be expressed as:
c=39,000+3t, where:
c is the number of cars sold and t is the number of trucks sold
Also, you know from the information provided that there were 216,000 cars sold last year, so you can solve the equation for t and replace the value of c to find the number of trucks sold last year:
c-39,000=3t
t=(c-39,000)/3
t=(216,000-39,000)/3
t=59,000
According to this, the equation that can be used to find the number of trucks t sold last year is: t=(c-39,000)/3.