Keywords:
Equation, variable, value, clear
For this case we have an equation with a variable of the form \(y = h (x)\). Where \(h (x) = 3x-19\). Given the value of\(h (x) = 71\), we want to find the value of the variable "x". So, we have:
\(h (x) = 3x-19\\71 = 3x-19\)
We must clear "x", for this, we add "19" to both sides of the equation:
\(71 + 19 = 3x-19 + 19\\90 = 3x\)
We divide between "3" on both sides of the equation:
\(\frac {90} {3} = \frac {3x} {3}\\30 = x\)
Thus, the value of the variable "x" is 30.
Answer:
\(x = 30\)
Option A
