Question

1) х : 5 = 21 : 15 2) (х -1)/9 = 2/3

Answer 1

Ответ:

Объяснение:

1) х : 5 = 21 : 15;

x=5*21/15;

x=7.

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2) (х -1)/9 = 2/3;

x-1=2/3 * 9;

x-1=18/3;

x=6+1;

x=7.

Answer 2

To solve these equations, let's go step by step:

1. х : 5 = 21 : 15

To solve this equation, we can cross-multiply and solve for х:

15 * х = 21 * 5

15х = 105

Divide both sides of the equation by 15:

х = 105 / 15

х = 7

So, the value of х is 7.

2. (х - 1)/9 = 2/3

To solve this equation, we can cross-multiply and solve for х:

3 * (х - 1) = 9 * 2

3х - 3 = 18

Add 3 to both sides of the equation:

3х = 18 + 3

3х = 21

Divide both sides of the equation by 3:

х = 21 / 3

х = 7

So, the value of х is 7.