Practice problem
Solve equation (A) and plug the result into expression (B). 2x=4(A)2x(B)\begin{array}{lc} 2x=4&\quad\small{(A)}\\ 2x&\quad\small{(B)} \end{array}2x=42x(A)(B)
111
222
333
444
Type a concept, like “slope” or “photosynthesis”.
