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3 years ago

3x - 5y = -9 x + 2y = 8

Mathematics

2 answers:

OlgaM077 [116]3 years ago

5 0

Answer:

x=2 y,=3

(2,3)

Step-by-step explanation:

3x - 5y = -9

x + 2y = 8

We will use elimination. Multiply the second equation by -3

-3(x + 2y) = 8*-3

-3x -6y = -24

Add this to the first equation

3x - 5y = -9

-3x -6y = -24

-----------------------

0 - 11y = -33

Divide each side by -11

-11y/-11 = -33/-11

y =3

Now substitute into the second equation to find x

x+ 2y = 8

x+2(3) =8

x+6 =8

Subtract 6 from each side

x+6-6=8-6

x=2

Rus_ich [418]3 years ago

3 0

Answer: 3x-5y=-9 is simplified to y=3/5x+9/5

x+2y=8 is simplified to y=-1/2x+4

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3 years ago

In Bangor it’s -3 F in Fairbanks it’s -12 F in Fargo it’s -8 F and in Calgary it’s -15 F in which city is to the coldest?

jonny [76]

Answer:

Calgary is the coldest

Step-by-step explanation:

The simple way to determine this will be to change the value of temperatures given in Fahrenheit to Celsius

32 F = 0°C

Formula to apply will be (T-32)×5/9 -------------where T is temperatures in Fahrenheit

Bangor is -3F-------------------change to Celsius

(-3-32)×5/9 =-35 × 5/9 = -19.44°C

Fairbanks is -12 ------------------------change to Celsius

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3 years ago

9. Solve for x,<br>9x - 25<br>5x + 7<br>N

kati45 [8]

Answer:

x = 8

Step-by-step explanation:

Simplifying

9x + -25 = 5x + 7

Reorder the terms:

-25 + 9x = 5x + 7

Reorder the terms:

-25 + 9x = 7 + 5x

Solving

-25 + 9x = 7 + 5x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-5x' to each side of the equation.

-25 + 9x + -5x = 7 + 5x + -5x

Combine like terms: 9x + -5x = 4x

-25 + 4x = 7 + 5x + -5x

Combine like terms: 5x + -5x = 0

-25 + 4x = 7 + 0

-25 + 4x = 7

Add '25' to each side of the equation.

-25 + 25 + 4x = 7 + 25

Combine like terms: -25 + 25 = 0

0 + 4x = 7 + 25

4x = 7 + 25

Combine like terms: 7 + 25 = 32

4x = 32

Divide each side by '4'.

x = 8

Simplifying

x = 8

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3 years ago

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3 years ago