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Alex Ar [27]
3 years ago
15

How do you solve the system of linear equations for this problem: (2.1x+4.2y=14.7) & (-5.7x-1.9y=-11.4)

Mathematics
1 answer:
Alenkinab [10]3 years ago
5 0
2.1x + 4.2y = 14.7 is the same as x + 2y = 7 (divide both sides by 2.1)
-5.7x-1.9y=-11.4 is the same as 3x + y = 6 (divide both sides by -1.9)

Rearrange the first equation to get x = 7 - 2y and substitute into the second equation, 3(7 - 2y) + y = 6, 21 - 6y + y = 6, 5y = 15, y = 3

Substitute y = 3 into the first equation x + 2(3) = 7, x = 1

x = 1 and y = 3
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b^-2-x^-2/b^-1+x^-1

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1. The sum of the angles is 90° The difference between twice the larger angle and the smaller
Ostrovityanka [42]

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\displaystyle 25°\:and\:°65

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morpeh [17]

Answer:

a) slope / m = 3

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Step-by-step explanation:

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( y1 - y2 ) / ( x1 - x2 )

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3

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y = mx + b

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Proportional is when it crosses origin ( 0, 0 ).

Not proportional is when it does not cross origin.

Hopefully this helps!

Brainliest please?

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