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DedPeter [7]
4 years ago
8

Answers for he ones circles??

Mathematics
1 answer:
Contact [7]4 years ago
3 0
1. 7x + 3 - 2x....x = 8
   7(8) + 3 - 2(8) = 56 + 3 - 16 = 43

4. 7 - (-2y) + y - 9....y = 6
     7 - (-2(6) + 6 - 9 = 7 + 12 + 6 - 9 = 16

7. -x + 8 + 7x - (-1).....x = -10
   -(-10) + 8 + 7(-10) + 1 = 10 + 8 - 70 + 1 = -51

10. 4x + 2y - x - 8....x = 1, y = 5
      4(1) + 2(5) - 1 - 8 = 4 + 10 - 9 = 5

13. 2x + 5y - 3x + (-8y)....x = -9, y = 9
      2(-9) + 5(9) - 3(-9) - 8(9) = -18 + 45 + 27 - 72 = -18


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Lady bird [3.3K]

Answer:

10 packs of juice and 15 packs of water was bought by Mr. Lincoln

Step-by-step explanation:

Mr. Lincoln buys juice and water for the school picnic. A pack of 8 juice boxes costs $5. A pack of 6 water bottles costs $3. Mr. Lincoln spends $95 for 170 juice boxes and bottles of water.

Solution:

Let x represent the number of packs of juice boxes bought by Mr. Lincoln and let y represent the number of packs of water bottles bought by Mr. Lincoln.

Each pack of juice cost $5 while each pack of water cost $3. Mr. Lincoln spends $95, therefore:

5x + 3y = 95       (1)

Each pack of juice contain 8 juice boxes and each pack of water contain 6 water bottles. Since 170 juice boxes and bottles of water was bought, therefore:

8x + 6y = 170         (2)

Solving equations (1) and (2) simultaneously. Multiply equation (1) by 2 and then subtract equation (2) from the result to get:

2x = 20

x = 10

Substitute x = 10 in equation (1):

5(10) + 3y = 95

50 + 3y = 95

3y = 45

y = 15

Hence 10 packs of juice and 15 packs of water was bought by Mr. Lincoln

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