Final answer:
To solve the system of equations by substitution, find the value of one variable and substitute it into the other equation. However, the given system of equations is inconsistent, meaning there is no solution.
Step-by-step explanation:
To solve the given system of equations by substitution, we need to solve one equation for one variable and then substitute that expression into the other equation.
Given the equations:
а - 1.23 = -3
0.26a + 0.62 = 12
From the first equation, we can find the value of 'a':
а = -3 + 1.23 = -1.77
Now, substitute this value of 'a' into the second equation:
0.26(-1.77) + 0.62 = 12
-0.459 + 0.62 = 12
0.161 = 12
The equation is inconsistent, meaning there is no solution to the system of equations. Therefore, there is no valid option as a solution.