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Dennis_Churaev [7]
3 years ago
14

Solve by using substitution or elimination by addition

Mathematics
1 answer:
mihalych1998 [28]3 years ago
3 0

Answer: A. The unique solution to the system is (1,-5)

Step-by-step explanation:

 You can follow these steps to solve the system of equations by the Elimination Method:

- Multiply the first equation by -3 and the second equation by 2.

- Add both equations and solve for "y".

Then:

\left \{ {{-3(2x - 5y) = -3(27)} \atop {2(3x + 2y)= 2(-7)}} \right.\\\\\left \{ {{-6x +15y = -81} \atop {6x + 4y= -14}} \right.\\..............................\\19y=-95\\y=-5

- Substitute the value of "y" into any original equation to find the value of "x". Then:

2x - 5(-5) = 27\\\\2x=27-25\\\\2x=2\\\\x=1

Therefore, the unique solution to the system is (1,-5)

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There are s swimmers in the swimming club. The club bought 15 swimming caps to split among its members. Write an expression that
vivado [14]

Answer:

15/s

Step-by-step explanation:

15 caps ÷ s = 15/s caps per swimmer

6 0
3 years ago
What should be done to both sides of the equation in order to solve y - 4.5 = 12.2?
maw [93]
Y - 4.5 = 12.2

your solving for y which means your trying to get rid of 4.5 so that y can equal something. The opposite of -4.5 would be +4.5, so you would add 4.5 to both sides to get 

y = 16.7

So your answer would be 

A. Add 4.5

and also dont' say your stupid because all you need is a little explanation and you'll get it, its very easy you just need to take the time to practice :-)
6 0
2 years ago
Select a setting so that each given point will lie within the viewing window.
NemiM [27]

Answer:

The given points are

(-13,3)\\(0,0)\\(-2,-7)

The setting would have a interval or 2 units above and below the minimum and maximum of each coordinate.

The given maxium horizontal coordinate is 0.

The given minimum horizontal coordinate is -13.

The given maximum vertical coordinate is 3.

The given minimum vertical coordinate is -7.

Now, we extend each maximum and minimum value by 2 units to create the setting.

So, the setting is

x_{min}=-15\\x_{max}=2\\ y_{min}=-9\\y_{max}=5

With a scale of 2 units.

6 0
3 years ago
NEED THE ANSWER ASAP PLEASE
timurjin [86]

Answer:

2

Step-by-step explanation:

\frac{y1 - y2}{x1 - x2}  \\  \frac{2 - 6}{ - 5 - ( - 3)}  \\  \frac{ - 4}{ - 5 + 3}  \\  \frac{ - 4}{ - 2}  \\  = 2

8 0
3 years ago
Read 2 more answers
Simplify<br> x^2(y^3)^4/xy^5=x^a•y^b
givi [52]

Answer: a = 1 b = 7

Step-by-step explanation:

x^2(y^3)^4/x.y^5 = x^a.y^b

x^2(y^12) = x^a.y^b

(x^2).(y^12)/x^y^5 = x.y^7

x.y^7= x^a . y^b -> <u>x^1.y^7</u>

7 0
2 years ago
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