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. A coffee merchant has two types of coffee beans, one selling for $3 per pound and the other for $6 per pound. The beans are to be mixed to provide 100 lb of a mixture selling for $4.98 per pound. How much of each type of coffee bean should be used to fo...

Solve the given system of linear inequalities by graphing: x+y>4 x-y<7

Solve the system by the substitution method. 5x+7y=-18 y=5x-14

Solve the system by the addition method x+3y=-2 5x+15y=-10

Solve By graphing 2x+y=2 2x+y=6

Solve the system by graphing 2x+y=4 2x+y=2