f(-5) = -4, and f(5)= 2 linear equation satisfying the conditions , if possible

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Question

f(-5) = -4, and f(5)= 2
linear equation satisfying the conditions , if possible

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Mathematics RuslanHeatt 6 months 2021-09-01T16:10:06+00:00 2021-09-01T16:10:06+00:00 1 Answers 6 views 0

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

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Orla · Answer 1 · 2021-09-01T16:11:12+00:00

Orla

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2021-09-01T16:11:12+00:00 September 1, 2021 at 4:11 pm

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Given:

f(-5) = -4, and f(5)= 2.

To find:

The linear equation satisfying the conditions.

Solution:

We have,

f(-5) = -4, and f(5)= 2

It means the function passes through the points (-5,-4) and (5,2). So, the linear equation of the function f is

$y-y_1=\dfrac{y_2-y_1}{x_2-x_2}(x-x_1)$

$y-(-4)=\dfrac{2-(-4)}{5-(-5)}(x-(-5))$

$y+4=\dfrac{2+4}{5+5}(x+5)$

$y+4=\dfrac{6}{10}(x+5)$

On further simplification, we get

$y+4=\dfrac{3}{5}(x+5)$

$y+4=\dfrac{3}{5}x+3$

$y=\dfrac{3}{5}x+3-4$

$y=\dfrac{3}{5}x-1$

Putting y=f(x), we get

$f(x)=\dfrac{3}{5}x-1$

Therefore, the required function is $f(x)=\dfrac{3}{5}x-1$ .