Question

Which of the following is a pair of like terms?
$5xy = 3axy$
$7 {m}^{2} n = - 2n {m}^{2}$
${a}^{2} b = {b}^{2} a$
$4x = 5x$
​

Answer 1

$5xy = 3axy \\ 7 {m}^{2} n = - 2n {m}^{2} \\ {a}^{2} b = {b}^{2} a \\ 4x = 5x \: \: ✔ \: ( \: like \: term)$