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'  ........