9 t-shirts and a hat costs £93.00
4 t-shirts and a hat costs £43.00.
How much does a t-shirt cost?
How much does a hat cost?
9t + h = 93
4t + h = 43 multiply this equation by -2.25 and add it to the first equation
-9t-2.25h = -97 (we are trying to 'eliminate' the 't' then solve for 'h')
-1.25 h = -4
h = L 3
Now yo can use this value of 'h' in one of the equations to solve for 't' ........