Which of the following is equivalent to the expression 72 - 4?
1 answer:
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Answer:
Cost of one pencil:
Cost of one eraser:
Step-by-step explanation:
Let be "p" the cost in dollars of one pencil and "e" the cost in dollars of one eraser.
Based on the information given in the exercise, you can set up the following system of equations:
You can use the Elimination Method to solve the system of equations.
Multiply the first equation by -3 ad the second one by 4. Then add the equations and solve for "e":
{
Substitute the value of "e" into any original equation and solve for "p":
Refine
Refine :
therefore:
Divide both sides by 2 :
add 4 to both sides:
Divide both sides by 4 :
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