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lbvjy [14]
3 years ago
10

WRITING Explain how to solve the system of linear equations

Mathematics
1 answer:
Keith_Richards [23]3 years ago
3 0

Step-by-step explanation:

2x - 3y =  - 4.....(1) \\  - 5x + 9y = 7.....(2) \\ \\(1) \times 5 \\ 10x - 15y =  - 20.....(3) \\ (2) \times 2 \\  - 10x + 18y = 14.....(4) \\  \\ (3) + (4) \\ 10x - 15y - 10x + 18y =  - 20 + 14 \\ 3y =  - 6 \\ y =  - 2 \\  \\ (1) \\ 2x - 3 \times ( - 2) =  - 4 \\ 2x + 6 =  - 4 \\ 2x =  - 10 \\ x =  \frac{ - 10}{2}  \\ x =  - 5

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Answer:

-3/8+5/16

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2×[-3]+1×5 all over 16

i.e -6+5/16

-1/16

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Solve this quadratic equation using factorisation. I will give brainliest, 5 stars and thanks! :) Kind of urgent, I don't have l
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Read 2 more answers
An isosceles triangle has two sides of equal length, a, and a base, b. The perimeter of the triangle is 15. 7 inches, so the equ
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The lengths that make the sense for the value of b are 0.5 inches and 2 inches.

<h2>Given </h2>

An isosceles triangle has two sides of equal length, a, and a base, b.

The perimeter of the triangle is 15.7 inches, so the equation to solve is 2a + b = 15.7.

<h3>What is the triangle inequality theorem?</h3>

If two sides of a triangle are unequal, the longer side has a greater angle opposite to it.

\rm a+a > b\\\\2a > b

The equation of the perimeter of the triangle;

\rm 2a+b = 15.7\\\\2a = 15.7-b\\\\a = \dfrac{15.7-b}{2}

1. Substitute b = 0.5 in the equation;

\rm a = \dfrac{15.7-b}{2}\\\\  a = \dfrac{15.7-0.5}{2} \\\\ a = \dfrac{15.2}{2}\\\\a = 7.6

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Verify the triangle inequality theorem;

0.5 + 7.6 > 7.6 is true

7.6 + 7.6 > 0.5 is true

2. Substitute b = 2 in the equation;

\rm a = \dfrac{15.7-b}{2}\\\\  a = \dfrac{15.7-02}{2} \\\\ a = \dfrac{13.7}{2}\\\\a = 6.85

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Verify the triangle inequality theorem;

0.5 + 76.85 > 6.85 is true

6.85 + 6.85 > 2 is true

Hence, the lengths that make the sense for the value of b are 0.5 inches and 2 inches.

To know more about the Triangle inequality theorem click the link given below.

brainly.com/question/1026055

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