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02.08.2019 •
Mathematics
At the supermarket, each pound of soy beans costs 5 times as much as each pound of wheat. if the total cost of 4.7 pounds of soy beans and 2.4 pounds of wheat is $51.80, what is the cost of each pound of soy beans and each pound of wheat?
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Ответ:
y= wheat
x= 5y (because soy beans cost five times as much as wheat)
4.7x+2.4y= $51.80
Substitute x=5y
4.7(5y)+2.4y=51.80
23.5y+2.4y=51.80
25.9y=51.80
Divide both sides by 25.9
y=$2 cost of wheat per pound
x= 5y
=5(2)
=$10 cost of soy beans per pound
Check:
4.7x+2.4y= $51.80
4.7(10)+2.4(2)=51.80
47.0+4.80=51.80
51.80=51.80
Hope this helps! :)
Ответ:
x ≥ 0
Step-by-step explanation:
The absolute value of x+8 equals itself, thus x must be a real number (0 or any positive number).