Endothermic reactions are the opposite. Writing word equations Chemical reactions can be represented by word equations. Learn more in this KS3 Chemistry guide from Bitesize. Writing symbol ...

For example, the simultaneous equations \(3a + 2b = 17\) and \(4a - b = 30\) have no common coefficient as the coefficients of \(a\) are 3 and 4, and the coefficients of \(b\) are 2 and -1.