Question: Can you help me answer these two questions? Show steps and answers. 15. Determine whether each system of linear equations has (a) one solution, (b)

Can you help me answer these two questions? Show steps and answers.

15. Determine whether each system of linear equations has (a) one solution, (b) infinitely many solutions, or (c) no solution. Find ALL solutions whenever they exist. (12) a. 2x - 3y = 4 7x + 4y = 5 b. 3x - 4y =7 9x - 12y = 14 C. 2x - 3y = 8 -4x + 6y = -16 16. Formulate, but do not solve, the problem. (4) The Coffee Shoppe sells a gourmet coffee blend made from two coffees, one costing $8 per pound and the other costing $9 per pound. If the blended coffee sells for $8.60 per pound, find how much of each coffee is used to obtain the desired blend. Assume that the weight of the blended coffee is 100 pounds

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