In order to find at what value of the variable x the function y = 4x – 1 takes a value equal to 11, we will compose and solve the equation.
Substitute y = 11 into the equation and solve the resulting one-variable linear equation.
11 = 4x – 1;
Since there are no parentheses in the equation, you and I can go straight to the grouping in different parts of the equation of terms with and without variables.
-4x = -1 – 11;
Here are similar ones on the right side of the equation:
-4x = -12;
x = -12: (-4);
x = 3.
Let’s check if we found the value of the variable correctly.
y (3) = 4 * 3 – 1 = 12 – 1 = 11.
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