Linear word-problem model
Linear functions and graphs · Stage 2
Recognize the pattern
Separate the fixed starting amount from the amount per unit.
Useful ruletotal = rate·quantity + initial
Build on: ALG-05
Try it before reading the solution
A taxi charges $4 plus $2 per mile. Write C for m miles.
This teaching example is original and is not an official SAT question.
Reasoning
The variable cost is 2m and the initial fee is 4.
AnswerC = 2m + 4
03 · Next step
See membership →Ready for adaptive practice
Practice questions remain in English, as on the SAT.