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Norma-Jean [14]
3 years ago
5

Solve 3x – 7y = 25 5x – 8y = 27 using matrices. (25, 27) (27, 25) (-1, -4) (4, 1)

Mathematics
1 answer:
lianna [129]3 years ago
8 0
<span>This is somewhat similar to something called Cramer's Rule http://www.1728.org/cramer.htm

A) 3x – 7y = 25
a =3 b=-7 e=25
B) 5x – 8y = 27</span>
c=5 d=-8 f=27

dn = |a b |
        |c d |

dn = |3 -7|
       |5 -8

dn = (3*-8) -(5*-7)

dn = -24 +35

dn = 11

x = |e b|
      |f d|
divided by dn

x = |25 -7|
      |27 -8|
divided by dn

x = -200 -(-189) / 11
x = -11 / 11
x = -1

y = |a e |
     |c f |
divided by dn

y = |3 25|
     |5 27|
divided by dn

y = 81 -125 / dn = -44 / 11 =-4

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Answer:

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Step-by-step explanation:

-3   2

               -15  -   2         =      -17

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5<em> </em>   -1

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                 2      -   <em>15</em>    =     -13

<em>-3</em>   2

area = |-17 - 26 - 24 - 13|/2 = |-80|/2 = 80/2 = 40

Answer: 40

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Answer: A

Step-by-step explanation:

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6 0
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Answer:

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Answer:

Masses Below 6: Histogram

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Step-by-step explanation:

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Now let's look at the second problem. If just one side has a length of (4x - 2y), then that means there must be another side with the same length, as it is a rectangle we're talking about here. That means we should multiply the known length by two and subtract it from the perimeter like this:

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