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Leno4ka [110]
3 years ago
13

Solve the system of equations below. 5x-2y=18 3x+3y=15

Mathematics
2 answers:
JulsSmile [24]3 years ago
8 0

Answer:

(4,1)

Step-by-step explanation:

Shalnov [3]3 years ago
4 0

\left\{\begin{array}{ccc}5x-2y=18&|\cdot3\\3x+3y=15&|\cdot2\end{array}\right\\\\\underline{+\left\{\begin{array}{ccc}15x-6y=54\\6x+6y=30\end{array}\right}|\text{add both sides of the equations}\\.\qquad21x=84\ \ \ \ |:21\\.\qquad\boxed{x=4}\\\\\text{put the value of x to the second equation}\\\\3(4)+3y=15\\12+3y=15\ \ \ \ |-12\\3y=3\ \ \ \ |:3\\\boxed{y=1}\\\\Answer:\ x=4,\ y=1\to \boxed{B.\ (4,\ 1)}

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siniylev [52]

Answer:

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4 0
2 years ago
Can anyone please help with these 2 questions. If you can, please show step-by-step.
valentinak56 [21]

Answer:

1. x = 21

2. m∡ABC =  51°

Step-by-step explanation:

First problem, solve for x

the sum of inside angles of a triangle is 180

also the supplementary angle for L = 180 - 100 is 80°

now you can add all angles

80 + 2x - 11 + 2x + 27 = 180

4x + 96 = 180

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x = 21

Second problem, solve for m∡ABC

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also the supplementary angle for C = 180 - 148 is 32°

now you can add all angles

31 + 2x - 15 + x - 5 = 180

3x + 12 = 180

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x= 56,

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8 0
3 years ago
Read 2 more answers
Please try to explain step by step<br>Thanks in advance ​
guajiro [1.7K]

Answer:

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Step-by-step explanation:

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5 0
2 years ago
Suppose that 10% of adults belong to health clubs, and 40% of these health club members go to the club at least twice a week. Wh
kozerog [31]

Answer:

4% of all adults go to a health club at least twice a week

Step-by-step explanation:

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  • the proportion of these adults (health club members) go to the club at least twice a week is 40%, that is 0.40.

Thus, the proportion of all adults go to a health club at least twice a week is

0.10 × 0.40 = 0.04, that is 4%

3 0
3 years ago
An European style café latte uses 1.5oz of espresso and 8oz of milk. You accidentally add 12oz of milk to 1.5oz of espresso. How
ELEN [110]

Answer:

2.5

Step-by-step explanation:

The one thing that changes in the problem is the milk. It goes from 8 oz. to 12 oz., so we are going to use the oz count to determine the amount of espresso. Since the amount of milk rose, so is the amount of espresso. Now, you take the larger number and divide it by the smaller number (12 / 8 = 1.5). This answer will tell you by what multiple it increased by. Once you have the multiple it increased by, you multiply that answer (1.5) by the other unknown changing number, so 1.5 x 1.5. Do this and you get 2.5.

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3 years ago
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