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vaieri [72.5K]
3 years ago
8

Need help pls solve 7x-4y=-7 5x+y=22

Mathematics
2 answers:
Vinil7 [7]3 years ago
8 0
I think this would be the correct answer <span>{x,y} = {3,7}</span><span> </span><span />
aev [14]3 years ago
3 0
<span>7x-4y=-7
5x+y=22

multiply 4 on the 2nd equation
</span>20x+ 4y=88

now you have
7x -4y = -7 
20x + 4y = 88
--------------------add
27x = 81
x = 3

7x-4y=-7
7(3)-4y=-7
-4y = -28
y = 7

answer (3, 7) is the solution
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Select the correct answer.
Kaylis [27]

For this case we have that by definition, the volume of a rectangular prism is given by:

V = A_ {b} * h

Where:

A_ {b}:It is the area of the base of the prism

h: It is the height

A_ {b} = w * l

Where:

w: is the width

l: is the length

According to the data of the statement we have:

w = 16 \ in\\l = 4h\\V = 4,096 \ in ^ 3

Substituting the data we have:

A_ {b} = 16 * 4h = 64h\\64h * h = 4,096\\64h ^ 2 = 4,096\\h ^ 2 = \frac {4096} {64}\\h ^ 2 = 64\\h = \pm \sqrt {64}\\

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Answer:

8 \ in

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3 years ago
Need help with this question
Keith_Richards [23]
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then use the process of elimination:
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