The ratio of the cargo cars to passenger cars in the rail yard is 33:11. If there are 132 cargo cars,how many passenger cars are
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SOLUTION
Write out the equation
To solve this system of equation, the aprropriate method will be substitution
Substitute the expression for y into the second equation for y, we have
Expand the paranthesis we have
Divide both sides by 4, we have
Since the value of x has been obtained, we substitute into the first equation
Therefore
x = -3, y= -4