When two angles are complementary, the sum of their measures is equal to 90 degrees. Given that the measures of the angles are \(3x\) and \(4x + 1\), we can write the equation for their sum as follows:
\[ 3x + (4x + 1) = 90 \]
Now, let's simplify the equation:
- Combine like terms: \[ 3x + 4x + 1 = 90 \] \[ 7x + 1 = 90 \]
So, the simplified equation corresponding to the measures of the angles is:
\[ 7x + 1 = 90 \]