Charmaine's Coffee Shop makes a blend that is a mixture of two types of coffee. Type A coffee costs $5.20 Charmaine per pound, and type B coffee costs $4.15 per pound. This month's blend used three times as many pounds of type B coffee as type A, for a total cost of $688.35. How many pounds of type A coffee were used?

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step-by-step explanation:

-387129 iq

the system of inequalities is

step-by-step explanation:

step 1

find the equation of the dashed line

we have the points

(0,0) and (3,1)

the line passes through the origin, so, is a direct variation

find the slope

the equation of the dashed line is

the solution of the inequality a s the shaded area above the dashed line

therefore

the equation of the inequality a is

step 2

find the equation of the solid line

we have the points

(4,0) and (0,4)

find the slope

the equation of the solid line is

the solution of the inequality b s the shaded area below the solid line

therefore

the equation of the inequality b is

step 3

the system of inequalities is

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step-by-step explanation: