Given for the second question on the sheet:
One loaf of bread and six rolls cost $1.80
Let the cost of one loaf of bread = x
Let the cost of one roll = y
So,
And Two loaves of bread and four rolls cost $2.40
So,
substitute with (x) from equation (1) into equation (2) then solve for (y)
substitute with (y) into equation (1) and solve for x:
So, the answer will be:
The cost of one loaf of bread = $0.90