Solving systems of equations help

There's a word problem I don't know how to solve. The answer is 70 soybeans, 30 corn, but I don't know how to get to that answer:

"Mrs. Griffin wants to plant soybeans and corn on 100 acres of land. Soybeans require 6 hours of labor per acre, and corn requires 8 hours of labor per acre. If Mrs. Griffin has 660 hours available, how many acres of each crop should she plant?"

Quote:

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Originally Posted by guitarmatt

There's a word problem I don't know how to solve. The answer is 70 soybeans, 30 corn, <--- that is definitely wrong! 70 beans and 30 corns(?) are not worth 660 hours of work.
but I don't know how to get to that answer:

"Mrs. Griffin wants to plant soybeans and corn on 100 acres of land. Soybeans require 6 hours of labor per acre, and corn requires 8 hours of labor per acre. If Mrs. Griffin has 660 hours available, how many acres of each crop should she plant?"

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1. Let x denotes the area planted with beans and y the area planted with corn.

2. According to the text you'll get:



3. Solve for x and y.

This sure doesn't belong in "calculus"!