Solve the given systems of inequalities by graphing.

1. A small generator burns two types of fuel: low sulfur and high sulfur, to produce electricity. For one hour, each gallon of low sulfur emits three (3) units of sulfur dioxide, generates four (4) kilowatts electricity and costs P600. Each gallon of high sulfur emits five (5) units of sulfur dioxide, generates four (4) kilowatts electricity and costs P500. The environmental protection agency insists that the maximum amount of sulfur dioxide that can be emitted per hour is 15 units. Suppose that at least 16 kilowatts electricity must be generated per hour, how many gallons of low sulfur and how many gallons of high sulfur must be utilized per hour in order to minimize the cost of fuel?

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2. Solve the given systems of inequalities by graphing. a. f. [y24-2x (x-121 lyEx - 2 b. 5x+ y 2x - 2