human
Recognise whether you need to add or subtract linear equations in order to eliminate a variable Tom and Katie are discussing this pair of simultaneous equations: \( \begin{array}{l}3 x-2 y=15 \\ x+2 y=20\end{array} \) Tom says if you add the two equations together you will eliminate a variable

Katie says if you subtract the two equations together you will eliminate a variable

Who is correct? Only
Katie
gpt
Subtracts simultaneous equations when addition is required