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poizon [28]
3 years ago
15

Solve by elimination 5x+2y=-11 and 3x+2y=-9

Mathematics
2 answers:
pshichka [43]3 years ago
8 0

Answer:

5x + 2y =  - 11 -  -  - (a) \\ 3x + 2y =  - 9 -  -  - (b) \\ (a) - (b) :  \\ 2x + 0y =  - 2 \\ x =  - 1 \\ (3 \times  - 1) + 2y =  - 9 \\  - 3 + 2y =  - 9 \\ 2y =  - 6 \\ y =  - 3 \\ { \boxed{x =  - 1}} \\ { \boxed{y =  - 3}}

forsale [732]3 years ago
6 0

Answer:

(- 1, - 3 )

Step-by-step explanation:

Given the 2 equations

5x + 2y = - 11 → (1)

3x + 2y = - 9 → (2)

Subtract (2) from (1) term by term to eliminate y

2x = - 2 ( divide both sides by - 2)

x = - 1

Substitute x = - 1 into either of the 2 equations and solve for y

Substituting into (1)

5(- 1) + 2y = - 11

- 5 + 2y = - 11 ( add 5 to both sides )

2y = - 6 ( divide both sides by 2 )

y = - 3

solution is (- 1, - 3 )

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Answer:

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3) 110

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3 years ago
I just need help because i dont understand it
Y_Kistochka [10]

Answer:

8

Step-by-step explanation:

2 times 4 is 8

4 0
3 years ago
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A bee flies at 10 feet per second directly to a flowerbed from its hive. The bee stays at the flowerbed for 18 minutes, and then
uysha [10]

Answer:

Step-by-step explanation:

d = distance from hive to flowers, in feet

flying time = 23 min - 18 min = 5 min = 300 sec

time flying to flowers = d ft × (1 sec)/(10 ft) = (d/10) sec

time flying to hive = d ft × (1 sec)/(6 ft) = (d/6) sec

d/10 + d/6 = 300 sec

:::::

d/10 + d/6 = 3d/30 +5d/30 = 8d/30 = 300

d = 300×30/8 = 1,125 ft

3 0
3 years ago
Eli is following this recipe to bake bread rolls. He uses 600ml of water. How much of the others ingredients does he use? 600g f
RoseWind [281]

Answer:

720 grams of flour.

10.8 grams of salt.

14.4 grams of yeast

36 ml of oil.

Step-by-step explanation:

The recipe is:

600g flour

9g salt

12g yeast

30ml oil

500ml water

Now we use 600ml of water.

We can take the quotient between the amount of water we use and the amount of water in the recipe, this is:

600ml/500ml = 1.2

Then the ratio between the quantities we need to use and the quantities un the recipe should be always 1.2

Or the quantities that Eli needs to use will be 1.2 times the ones shown in the recipe.

Then she needs to use:

1.2*600g flour = 720 grams of flour.

1.2*9g salt = 10.8 grams of salt.

1.2*12g yeast = 14.4 grams of yeast

1.2*30ml oil = 36 ml of oil.

7 0
3 years ago
Nikki works at a store that sells consumer electronics. She earns $12 per hour, plus a commission of 5% of her total sales amoun
Mazyrski [523]

Answer:

See below.

Step-by-step explanation:

So, Nikki earns $12 per hour.

And she also earns a 5% or 0.05 commission of her total sales each day.

On Saturday, she worked eight hours and she earned $139. In other words, she earned 8(12) or $96 from working her hours and another $43 (139-96) from her commission.

Thus:

139=96+0.05x

Where x represents Nikki's total sales on Saturday.

Further notes:

To solve, subtract 96 from both sides and divide by 0.05:

139=96+0.05x\\43=0.05x\\x=\$860

Thus, her total sales that day were $860.

6 0
3 years ago
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