Question

Jayne stopped to get gas before going on a road trip. The tank already had 4 gallons of gas in it. Which equation relates the total amount of gasoline in the tank, y, to the number of gallons that she put in the tank, x?

A. y=4+x
B. y = x − 4
C. y = 4 · x
D. y = x ÷ 4

Answer 1

The equation y=x+4 gives the relation

answer A.

Answer 2

Given:

Jayne has 4 gallons of gas.

The total amount of gasoline= y

The amount of gasoline she added in = x

To find :

The most suitable equation.

Solution:

Jayne has 4 gallons of gas.

The total amount of gasoline= y

The amount of gasoline she added in = x

making an equation

$y = 4 + x$

y is the total amount of gasoline.

4 gallons were already present in the car

x is the amount of gasoline that Jayne added.

Since the total amount of gasoline is y then the equation will be 4 + x as it is the quantity that was present at first and the quantity that was added later.

The correct answer is (A)

$y = 4 + x$