human
Recognise whether you need to add or subtract linear equations in order to eliminate a variable What do you need to do to eliminate the \( q \)s in each of these pairs of simultaneous equations?
\begin{array}{cc}
  Pair 1 & Pair 2 \\
\( 2p-4q=6 \) & \( 2p-4q=6 \)\\
\( 7p+4q=9 \) & \( 7p-4q=9 \)
\end{array}
 Add Pair \( 1 \)
Add Pair \( 2 \)
gpt
Believes that when eliminating a variable, if the signs of the terms with matching coefficients are the same, we add the equations.