We can see from the picture of the question that the error in solving this system of linear equations was that when the second equation was multiplied by -4. We need to multiply the whole equation, including the right side of the equation. We can see that:
And the result must be:
And the second equation was: -4x + 8y = -13 (this is not correct.)
Therefore, the right side of the equation was not multiplied by -4 (this was the error.) (First option.)
The correct answer is:
Substituting this value in the first equation, we can, then, find the value for x: