The function is given by the formula y = -3x + 3. Find the value of the argument at which the value of the function is -3; 9.

To solve this problem, we must substitute the value of the function, that is, y = -3, y = 9 in the formula y = -3x + 3. Solve the resulting equations, we will find the value of the argument, that is, x.

1) If y = -3, then:

-3x + 3 = -3;

-3x = -3 – 3;

-3x = -6;

x = -6 / -3;

x = 2;

Answer: 2.

2) If y = 9, then:

-3x + 3 = 9;

-3x = 9 – 3;

-3x = 6;

x = 6 / -3;

x = -2;

Answer: -2.

In the resulting equation, the unknown number is a factor. To find its value, we divide the product by a known factor. When a positive number is divided by a negative number, we get a negative result.