Question 198189
A grocery store sells Columbian coffee for $4 dollars per pound and Jamaican coffee for $12 dollars per pound. How much of each are needed to create a mixture weighing 10 pounds and costing $60? 
           a. Write two linear equations in standard form to model this problem 
let x be pounds Columbian; y be pounds Jamaican
{{{10=x+y}}}
{{{60=4x+12y}}}
           b. change your equation to slope intercept form. use your calculator to graph. Label the intersection of your graph and label each line with its equation in slope intercept form 
{{{y=10-x}}}
{{{y=5-(x/3)}}}
{{{graph( 300, 200, -10, 10, -10, 10, 10-x, 5-(x/3))}}}
(7.5, 2.5)
           c. How many pounds of each coffee is needed?
7.5lbs Columbian
2.5lbs Jamacian