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4 years ago

Using =2L+2W, Find L when P is 50 and W is 10

Mathematics

1 answer:

mestny [16]4 years ago

5 0

Answer:

L = 15

Step-by-step explanation:

P = 2L + 2W

you know that P = 50, W=10

So you have to replace those values on the equation

50 = 2L + 2*(10) --> Replace P and W

50 = 2L + 20 --> Multiply and now you are going to separate the unknown and the constants.

Remember that if you send a constant to the other side of the equal the sign will change to its opposite

50 - 20 = 2L --> Solve the constants

30 = 2L --> Now for the L, you have to leave it alone, so the 2 that is multiplying you have to send it to the other side of the equal but with the opposite operation, the opposite operation of multiplying is dividing, so you have:

30/2 = L

L= 15

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Answer:

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Step-by-step explanation:

let P represent PE and S represent Science with P > S, then

P + S = 154 → (1)

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Adding the 2 equations term by term eliminates S

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Substitute P = 83 into (1)

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S = 71

Hence PE mark = 83 and Science mark = 71

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4 years ago

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