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Keith_Richards [23]
3 years ago
12

3x + 5y = -27 |-7x - 5y = 3

Mathematics
1 answer:
Ivanshal [37]3 years ago
4 0

Answer:

  (x, y) = (6, -9)

Step-by-step explanation:

Add the two equations to eliminate the y-variable:

  (3x +5y) +(-7x -5y) = (-27) +(3)

  -4x = -24 . . . simplify

  x = 6 . . . . . . divide by -4

Substitute this value of x into the first equation and solve for y:

  3(6) +5y = -27

  5y = -45 . . . . . . . subtract 18

  y = -9 . . . . . . . . . divide by 5

The solution to this system of equations is (x, y) = (6, -9).

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Halp how to factor 4x-2
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Step-by-step explanation:

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Ray industries bought a touchscreen monitor for $1200 it is expected to depreciate at a rate of 25% per year what was the value
max2010maxim [7]

So for this problem, we will be using the exponential equation format, which is y = ab^x. The a variable is the initial value, and the b variable is the growth/decay.

Since our touchscreen starts off at a value of 1200, that will be our a variable.

Since the touchscreen is decaying in value by 25%, subtract 0.25 (25% in decimal form) from 1 to get 0.75. 0.75 is going to be your b variable.

In this case, time is our independent variable. Since we want to know the value 3 years from now, 3 is the x variable.

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7 0
3 years ago
The area of a triangle is 45cm2 and the height is 9 cm. What is the length of the base?
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Formula
A=bh divides by 2

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5 0
3 years ago
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