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patienxel
06.10.2019 •
Mathematics
Aperson wishes to mix coffee worth $9 per lb with coffee worth $3 per lb to get 150 lb of a mixture worth $5 per lb. how many pounds of the $9 and the $3 coffees will be needed
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Ответ:
50 lb of $9 coffee and 100 lb of $3 coffee
Step-by-step explanation:
Let x = the pounds of $9 coffee. Then
150 - x = the pounds of $3 coffee.
We can calculate the value of the coffee in each mixture.
x lb × $9/lb + (150 -x ) lb × $3/lb = 150 lb × $5/lb
9x + 3(150 - x) = 750
Distribute the 3 9x + 450 - 3x = 750
Combine like terms 450 + 6x = 750
Subtract 450 from each side 6x = 300
Divide each side by 6 x = 50 lb of $9 coffee
150 - x = 100 lb of $3 coffee
The person must mix 50 lb of $9/lb coffee with 100 lb of $3/lb coffee to get 150 lb of $5/lb coffee.
Check:
50 × 9 + 100 × 3 = 750
450 + 300 = 750
750 = 750
Ответ:
The found values are:
A = 1/3
B = -8/3
Step-by-step explanation:
We know that general equation is given by:
y = mx + c
where m is the slope and c is a constant.
x + 3y = -5
y = -(1/3)x - 1/3(5)
Slop of the equation is -(1/3). As parallel line have same slope, substitute it in the first equation:
Ax + By = 3
By = -Ax - 3
By = (1/3)x - 3
Hence, A = 1/3
Substitute point (-7,2) into the equation:
B(2) = (1/3)(-7) -3
B(2) = -7/3 - 3
B(2) = -16/3
B = -16/6
B = -8/3