8. On a trip, a student drove 40 miles per hour for 2 hours and then drove 30 miles per hour for 3
2 answers:
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Answer:
Zach earns $10 and for the pair of boots Zach earns $15
Step-by-step explanation:
Let be x the number of pairs of shoes
Let be y the number of pairs of boots
Then we can establish the following system of equations with the data of the statement:
We subtract the second equation from the first equation to eliminate the variable y and solve for x, just like this:
For y replacing in the first equation the value of x and solving for y:
So for the pair of shoes Zach earns $10 and for the pair of boots Zach earns $15
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