-3x +y =12 -y + 9x =0 Método de Sustitución
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The jurassic zoo charges $14 for each adult admission and $5 for each child. the total bill for 77 people from a school trip was $565. how many adults and how many children went to the zoo? i

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Amap has a scale of 3.5 inches = 20 kilometers. if the distance between two cities on the map is 4.9 inches, what is the actual distance between the two cities?