B explanation: The variable is the 3, as the 3 is the amount per ride but we don’t know how many rides so you would multiply the unknown (x) by the 3, so this answer would be correct.
D explanation: if you replace the four with the x for both they both equal $28.
Step-by-step explanation: the $4.75 per mile and $3 per mile represent the "m" in y=mx+b. you have to multiply 4.75 by the number of miles travelled, and add that to the $9 additional fee to find the total amount charged. for the "driveyou" equation, you multiply $3 by the number of miles travelled, which is "x" in the equation. hope that helps, i'm new to brainly :)
