Question

Чему равно значения выражения 0.9x-(0.7x+0.6y)если, 3y-x =9?

Answer 1

0.9x - (0.7x + 0.6y) = 0.9x - 0.7x - 0.6y = 0.2x - 0.6y = -0.6y  + 0.2x = -0.2(3y-x)
3y-x = 9
-0.2*9 = -1.8 

Answer 2

Solution for 0.9x - (0.7x + 0.6y) when 3y - x = 9

To find the value of the expression 0.9x - (0.7x + 0.6y) when 3y - x = 9, we can follow these steps:

1. Substitute the value of x from the given equation 3y - x = 9: - We can rearrange the equation to solve for x: x = 3y - 9.

2. Substitute the value of x into the expression 0.9x - (0.7x + 0.6y): - Replace x with 3y - 9 in the expression: 0.9(3y - 9) - (0.7(3y - 9) + 0.6y).

3. Simplify the expression: - Perform the arithmetic operations to simplify the expression and find the value.

Let's proceed with the calculation.

Calculation

Substituting the value of x into the expression: 0.9x - (0.7x + 0.6y) becomes 0.9(3y - 9) - (0.7(3y - 9) + 0.6y).

Simplifying the expression: 0.9(3y - 9) - (0.7(3y - 9) + 0.6y) = 2.7y - 8.1 - (2.1y - 6.3 + 0.6y) = 2.7y - 8.1 - 2.1y + 6.3 - 0.6y = (2.7y - 2.1y - 0.6y) + (-8.1 + 6.3) = 0.6y - 1.8

Answer

The value of the expression 0.9x - (0.7x + 0.6y) when 3y - x = 9 is 0.6y - 1.8.