Ok for some reason I'm not understanding this question or how to approach it

Express i and j in terms of a and b

a = 2i + 3j

b = i-j

Any help would be great, thanks.

The answer is

$\displaystyle i =\frac{1}{5}a +\frac{3}{5}b$

$\displaystyle j = \frac{1}{5}a -\frac{2}{5}b$