2/5x – 1/5y = 98 2/7x – 1/14y = 55 If the ordered pair (x, y) satisfies the system of equations shown above, what is the v

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Question

2/5x – 1/5y = 98
2/7x – 1/14y = 55
If the ordered pair (x, y) satisfies the system of
equations shown above, what is the value of x?

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Mathematics Vân Khánh 4 years 2021-07-27T02:31:06+00:00 2021-07-27T02:31:06+00:00 1 Answers 14 views 0

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Captcha* Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )

Answer*

kimchi2 · Answer 1 · 2021-07-27T02:32:56+00:00

kimchi2

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2021-07-27T02:32:56+00:00 July 27, 2021 at 2:32 am

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Answer:

x = 140

Step-by-step explanation:

Given the equations

$\frac{2}{5}$ x – $\frac{1}{5}$ y = 98 ( multiply through by 5 to clear the fractions )

2x – y = 490 → (1)

$\frac{2}{7}$ x – $\frac{1}{14}$ y = 55 ( multiply through by 14 to clear the fractions )

4x – y = 770 → (2)

Subtract (1) from (2) term by term to eliminate y

2x + 0 = 280

2x = 280 ( divide both sides by 2 )

x = 140