Teas costing $7 per pound are to be mixed with teas costing $4 per pound to make a 30-pound mixture. If the mixture is to sell for $6 per pound, how many pounds of each kind of tea should be used? A) 12 lb at $7/lb, 18 lb at $4/lb B) 15 lb at $7/lb, 15 lb at $4/lb C)20 lb at $7/lb, 10 lb at $4/lb

answer:   14

step-by-step explanation:          

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207/8 is the right

check above link.

graphically?   well, you graph them both, the solutions is where they both intersect each other, since there are two solutions, meaning they will meet twice, or namely the linear will run into the quadratic curve twice, and where they meet, those x,y coordinates are the solutions to the system.