Question 807731
Let x = how many small
Let y = how many large


SIX NOTEBOOKS:  x+y=6

SPENT $48:  6x+10y=48



Various ways to solve.  One method can be, simplify the money equation.
3x+5y=24.
Multiply the notebook count equation by 3 to get 3x+3y=18 and subtract this equation from the simplified money equation:
(3x+5y)-(3x+3y)=24-18
and solve .... first for y.
...!
Can you do that, and then continue for finding x.