Proper because improper would be 6 over 5 and mixes would be 1 and 1 over 6
One pound is about 0.5, so pretty much divide it by half
Answer:
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Y = x + 5....so we sub in x + 5 for y in the other equation
4x + y = 20
4x + x + 5 = 20
5x + 5 = 20
5x = 20 - 5
5x = 15
x = 15/5
x = 3
y = x + 5
y = 3 + 5
y = 8
solution is (3,8)
Use the Pythagorean therm , you know the a^2+b^2=c^2