a freight train is carrying goods across the country. the distance it has traveled varies directly with the number of gallons of fuel it has used. see the graph below.
(a) how many miles does the train travel per gallon?
(b) what is the slope of the graph?
so for b) its 200 miles for every 50 gallons
so the slope is y= 200x +50
use substitution to solve each system of equations. y = x + 5 3x + y = 25 62/87,21 y = x + 5 3x + y = 25 substitute x + 5 for y in the second equation. substitute the solution for x into either equation to find y. the solution is (5, 10)
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