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nadya68 [22]
3 years ago
7

Please help me!! find the solution of this system of equations -x + 5y=-18 5x - 9y= 10

Mathematics
1 answer:
pychu [463]3 years ago
8 0
Multiply the first equation by 5 to use the elimination method.

-5x+25y=-90
5x-9y=10

16y=-80
y=-5

Plug this y value into one of the original equations.

-x+5(-5)=-18
-x-25=-18
-x=7
x=-7

Final answer: (-7,-5)
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If the temperature at which a certain compound melts is a random variable with mean value 120 ???? ???? and standard deviation 2
bogdanovich [222]
Answer:
Temperature is measured in units of temperature.
In SI units,  it is K (degrees Kelvin).
In CGS units, it is °C (degrees Celsius)
In English units, it is °F (degrees Fahrenheit)

Therefore the mean and standard deviation will be measured in the selected units for temperature.
6 0
3 years ago
If a line slope of -1/2 contains the point (2,3), then it must also contain which of the following points?
tiny-mole [99]
Before the fraction: -1/2, i have a negative sign
use y=mx+b
3=-1/2(2)+b
3+1=-1+b+1
4=b
check your work
0=-1/2x+4
0+4=-1/2x
(4)÷(-1/2)=(-1/2x)÷(-1/2)
-2=x
another pair is (-2,0) use this to figure out the other points, and/or the points you have in the multiple choice.
5 0
3 years ago
Two angles of a quadrilateral measure 150 degrees and 105 degrees the other two angles are in a ratio of 3:4 what are the measur
iragen [17]

Answer:

First angle is 45 and the second angle is 60

Step-by-step explanation:

150 + 105 = 255

360 - 255 = 105

the ratio is 3:4 I add the ratio so 7

105 / 7 = 15

The first angle with the ratio of 3 is 15 x 3 = 45

The second angle with the ratio of 4 is 4 x 15 = 60

7 0
3 years ago
Order the numbers from least to greatest.<br><br> 1.25, 11, -0.41, -0.41111..., -16, 3/7
Zepler [3.9K]

Answer:

- 16 <  - 0.41111... <  -0.41 <  \frac{3}{7}  < 1.25 < 11

Step-by-step explanation:

\frac{3}{7}  = 3 \div 7  = 0.428...

5 0
2 years ago
Find the simple interest earned by each account. $800 principal at 4% interest for 5 years
Kipish [7]

Answer:

$160

Step-by-step explanation:

Simple interest=principal×time×rate/100

Principal=$800

Time=5years

Rate=4%

S.I=800×5×4/100

S.I=8×4×5

S.I=160

So the simple interest is $160

6 0
3 years ago
Read 2 more answers
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