need help fast

In step 2 it says the slope of \(\overline{AC}\) is \(-{1 \over 2}\), meaning the slope of the altitude is the negative reciprocal, which is 2 not -2.

The line would cross through the point \((2, 1)\), so the equation of this line would be \(y = 2x - 3\). 

So, we have to solve this system: \(y = 3\)

                                                      \(y = 2x - 3\)