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AlladinOne [14]
4 years ago
10

If you multiply the first equation by 6, the following system is the result.

Mathematics
2 answers:
Studentka2010 [4]4 years ago
7 0

Answer: Adding, for the solution the other answer has it.

Step-by-step explanation: Edg, answer.  

Luba_88 [7]4 years ago
5 0
Elimination means you’re adding/subtracting the equations such that one of the variables is cancelled out. You’re left with one equation and one variable which can then be solved.

In this case you can add the two equations so that the terms with x cancel:

3x + 9y = -42
-3x + 2y = -2
———————
0 + 11y = -44
y = -4

Then plug y back into either original equation to solve for x. I’ll use the first:

3x + 9(-4) = -42
3x - 36 = -42
3x = -6
x = -2
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Answer:

length : 8 m

width : 13/2 = 6.5 m

Step-by-step explanation:

area of rectangle = l(ength)×w(idth) = 52

l = 2w - 5

=> (2w - 5)×w = 52

=> 2w² -5w - 52 = 0

we know, when transforming this quadratic equation into a multiplication of two expressions of w, that we need to have 2w and w (to make 2w²), and then which 2 numbers multiply to 52 and add to -5 (when one is multiplied by 2 due to 2w) : -13 and 4

=> (2w - 13)×(w + 4) = 0

=> 2 solutions for w :

2w-13 = 0

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negative values for a side length of a shape do not make sense, so the only usable solution is w = 13/2

=> l = 2w - 5 = 13 - 5 = 8

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3 years ago
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Anon25 [30]

Answer: 3\sqrt{2}

Step-by-step explanation:

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