M= 6 (4,9 ) write the equation in the form ax+by =c

What is the slope of the equation y =

Boris needs to buy plastic spoons. brand a has a box 42 spoons for $2.37. brand b has a box of 72 spoons for $3.57. find the unit price for each brand. then state which brand is the better buy based on the unit price. round your answer to the nearest cent.

Me d is also an option but i couldn't get it in the picture