Pens and pencils are sold in a shop. 12 pencils cost f1.80
The ratio of the cost of a pen to the cost of a pencil is 7:3
Work out the cost of 5
pens.

Two blends of tea are mixed to make a blend that will be sold at the fair. black tea sells for $2.20 per pound and orange pekoe tea sells for $3.00 per pound. how much of each should be used to obtain a 4lb blend selling for $2.50 per pound?

Solve 2x+y=3 x+y=5 in substitution method

Can you me find the slope! (30 points)