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Rus_ich [418]
3 years ago
7

what should you multiply the first equation (top equation) by in order to eliminate the variable x when the two equations are ad

ded together? 3x-y=1 -12x+y=7
Mathematics
1 answer:
sammy [17]3 years ago
6 0
Multiply by 4.
______
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How do electromagnets differ from regular magnets?
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Answer:

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Step-by-step explanation:

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3 years ago
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Krista's mom has told her she needs to make the pen ½ the size that she had planned (5 feet long by 4 ½ feet wide). What will th
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Answer:

1. area of new pen = 11 \frac{1}{4} ft^{2}

2. i. 5 feet by 2\frac{1}{4} feet

ii. 2 ½ feet by 4 ½ feet

Step-by-step explanation:

The size of the pen as planned = 5 ft long by 4 ½ ft wide

Area of the pen = length x width

                           = 5 x 4 ½

                           = 5 x \frac{9}{2}

Area of the pen = \frac{45}{2}

                           = 22 ½ ft^{2}

But, Krista has to make the pen ½ the size of planned. So that;

area of new pen = ½ x 22 ½

        = ½ x \frac{45}{2}

        = \frac{45}{4}

        = 11 \frac{1}{4}

area of new pen = 11 \frac{1}{4} ft^{2}

The area of the new pen would be 11 \frac{1}{4} ft^{2}.

The possible values she could use are:

i. 5 feet by 2\frac{1}{4} feet

ii. 2 ½ feet by 4 ½ feet

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3 years ago
Which phrase does not have the same meaning as 3/w
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Answer:

y-7=4x(x+3)

Step-by-step explanation:

(The 4x is 4 times ...)

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3 years ago
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