Question 314465
Let,  Elsa begins the trip with G gallons of gas in her car.

Let  gallons of gas she has left in her tank = y  gallons after she travelled distance of x miles.

As per the problem and our asumption,

when at the strating of the tour x=0  , y=G
 after she travels x miles , y = G- x/1= G-x
So the equation is , y=G-x

To plot a graph, if we assume G=15 then our equation is y=15-x

To plot a graph, if we assume G=10 then our equation is y=10-x

To plot a graph, if we assume G=5 then our equation is y=5-x and so on....


{{{ graph( 300, 200, 0, 15, 0, 15, 15-x,10-x,5-x) }}}