Two straight lines are drawn from a shop example: the cost y for buying x items from shop A is modelled by y = 5x + 2 (pounds), and from shop B by y = 4x + 6 (pounds). Use algebra to find how many items make the same cost in both shops, and state that cost.
(a)Work out the number of items x for which the cost is the same in both shops.(2)
(b)State the common cost in pounds.(2)
(Total for Question 5 is 4 marks)