the perimeter of a rectangle is 52 cm. The length of the rectangle can be represented by (x.+5) and its width can be represented
1 answer:
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One sub costs $4.5 and one cookie costs $0.75 or 75 cents
Step-by-step explanation:
Let s be the cost of one sub
and
c be the cost of one cookie
Then according to given statements
"The cost of 3 subs and 7 cookies is $18.75"
"Five subs and 21 cookies cost $38.25"
Multiplying eqn 1 by 3
Subtracting Eqn 2 from Eqn 3
Dividing both sides by 4
Putting s=4.5 in Eqn 1
Dividing both sides by 7
So,
One sub costs $4.5 and one cookie costs $0.75 or 75 cents
Keywords: Linear Equations, Variables
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