Solve for y
y=400
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210000-250y+450y=290000
Use the distributive property to multiply 250 by 840-y.
210000+200y=290000
Combine -250y and 450y to get 200y.
200y=290000-210000
Subtract 210000 from both sides.
200y=80000
Subtract 210000 from 290000 to get 80000.
y=\frac{80000}{200}
Divide both sides by 200.
y=400
Divide 80000 by 200 to get 400.
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