Question

Formulate a system of equations that could be solved by multiplying one equation by 5 and then adding the two equations together to eliminate one of the variables.

Answer 1

$\ \ \ 5 \ (-\frac{1}{5} a = 10 - b) \\ + (2a = 5b -20) \\ \\ a = 30$

5× the first equation + the second equation will give an equation of 'a' to its value.