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8.4.9 On or off the line & Practice Problems

8.4.9 On or off the line & Practice Problems-example-1
User Ziggurism
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1 Answer

9 votes

Answer:

Number of quarters → 15

Number of dimes → 2

Explanation:

Let the number of dimes I have = y

And number of quarters = x

Since, I have amount in my pocket = $2

Therefore, 0.10y + 0.25x = 2

100(0.10y + 0.25x) = 100×2

25x + 10y = 200

5x + 2y = 40

2y = -5x + 40

y = -2.5x + 20 ---------(1)

Total number of coins in my pocket = 17

x + y = 17

y = -x + 17 ---------(2)

By using a graphing calculator we can graph these two lines (As attached)

Solution of the given system of equations will be the point of intersection of these lines.

Solution → (2, 15)

Number of quarters → 15

Number of dimes → 2

8.4.9 On or off the line & Practice Problems-example-1
User Arsen Mkrtchyan
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3.7k points