Question

7) 13/17=7+2у/858) 55/90=6-5у/18​

Answer 1

Ответ:

7) у= 29

8)у= -1

Объяснение:

всё на фотографии

Answer 2

To solve these equations for "у," you'll need to isolate "у" on one side of the equation. Let's work on each equation separately:

1. $\frac{13}{17} = 7 + \frac{2y}{858}$

First, let's simplify the right side of the equation by dividing 2 by 858:

$\frac{2}{858} = \frac{1}{429}$

Now, rewrite the equation:

$\frac{13}{17} = 7 + \frac{1}{429}y$

Next, subtract 7 from both sides to isolate the term with "y":

$\frac{13}{17} - 7 = \frac{1}{429}y$

Now, calculate the left side:

$\frac{13}{17} - \frac{7 \cdot 17}{17} = \frac{13 - 119}{17} = \frac{-106}{17}$

So, the equation becomes:

$\frac{-106}{17} = \frac{1}{429}y$

Now, multiply both sides by 429 to solve for "у":

$\frac{-106}{17} \cdot 429 = y$

$y = \frac{-106 \cdot 429}{17}$

Now, you can calculate the value of "у."

2. $\frac{55}{90} = 6 - \frac{5у}{18}$

First, simplify the left side of the equation by dividing both the numerator and denominator of the fraction by 5:

$\frac{55}{90} = \frac{11}{18}$

Now, rewrite the equation:

$\frac{11}{18} = 6 - \frac{5y}{18}$

Next, subtract 6 from both sides to isolate the term with "y":

$\frac{11}{18} - 6 = -\frac{5y}{18}$

Now, calculate the left side:

$\frac{11}{18} - \frac{6 \cdot 18}{18} = \frac{11 - 108}{18} = \frac{-97}{18}$

So, the equation becomes:

$\frac{-97}{18} = -\frac{5y}{18}$

Now, multiply both sides by -18 to solve for "у" and make the equation positive:

$\frac{-97}{18} \cdot (-18) = \frac{-5y}{18} \cdot (-18)$

$97 = 5y$

Now, divide both sides by 5 to find the value of "у":

$\frac{97}{5} = y$

$y = 19.4$

So, the solutions for "у" are:

1. $y = \frac{-106 \cdot 429}{17}$
2. $y = 19.4$