$\left \{ {{x-2y=2} \atop {3x+y=6\ |\cdot2}} \right. \\\\ \left \{ {{x-2y=2} \atop {6x+2y=12}} \right. \\+-----\\\\7x=14\ \ \ \ |:7\\x=2\\\\2-2y=2\\-2y=2-2\\-2y=0\\y=0\\\\ \left \{ {{y=0} \atop {x=2}} \right.$

7 0

3 years ago

The cost of a book is $x what is the expression in terms of x for the number of these books which are bought for $40

spayn [35]

Answer:

In x dollars,

number of book that can be bought = 1

So, In 1 dollar,

number of books that can be bought = 1/x

Hence in 40 dollars,

number of books that can be bought = 40/x

6 0

2 years ago

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Michelle's credit card has a 1% introductory APR for 12 months and after that a 19.9% APR for purchases. Michelle makes purchase

WARRIOR [948]

There is a lot of unnecessary information here made to trip you up.

1% of $150 is $1,50. If we add that to her purchase, we get $151.50

Provided she pays during the grace period, she should only have to pay $151.50

6 0

3 years ago

Read 2 more answers