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Furkat [3]
2 years ago
11

Serena bought 4 packs of pencils and 12 notebooks

Mathematics
2 answers:
Olin [163]2 years ago
6 0

Answer:

6

Step-by-step explanation:

that is what it said the correct answer was

Anarel [89]2 years ago
5 0

Answer: pencil (x) = 3.00, notebook (y) = 4.00

Step-by-step explanation:

Let pencils be denoted using 'x', and notebooks 'y'.

4x+12y = 60, 14x+7y=70

Let us use the method of elimination. However, neither variable has the same coefficient, so let us multiply the first equation using 7, and the second using 2.

7(4x+12y = 60) => 28x+84y=420

2(14x+7y=70) => 28x+14y=140

Let us subtract the second equation from the first. This eliminates the first variable x, and gives the equation 70y=280

Dividing either side of the equation by 70, we get y=4.

If we substitute (plug in) y=4 for the first equation we get x=3

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