Question #83656
2 Answers
A cassette costs $ 7 and a CD costs $ 15.
Explanation:
Let's assume that the cost of a cassette is
We can thus form 2 equations:
Equation 1:
Equation 2:
If we change equation 2 to make
Substituting this equation into the first one, we get:
Which is
Multiplying the whole equation by 2 gives
Solving for
So
Substituting
So the cost of a cassette is $ 7 and that of a CD is $ 15.
Cassettes are
Explanation:
Set up a system of equations, with x as cassettes and y as cds.
Now, use either substitution or elimination to solve. I show substitution below, but you get the same answer either way.
equation 1
equation 2
equation 1
CHECK