The function is given by the formula y = 0.4x + 3. A) find the value of the function

The function is given by the formula y = 0.4x + 3. A) find the value of the function if the value of the argument is 3 b) find the value of the argument at which the value of the function is 6

To solve this problem, we must substitute the value of the argument x = 3, and then the value of the function y = 6 into the formula y = 0.4x + 3.

1) If x = 3, then 0.4 * 3 + 3 = 1.2 + 3 = 4.2.

2) If y = 6, then:

0.4x + 3 = 6;

0.4x = 6 – 3;

0.4x = 3;

x = 3 / 0.4;

x = 7.5.

Answer: 4.2; 7.5.
In order to find the value of an unknown variable, I first grouped the members containing unknowns on the left side, and free members on the right. When transferring members, we change their sign to the opposite.