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PilotLPTM [1.2K]
3 years ago
15

Solve each system using elimination. − 5 = −10 − + = 6

Mathematics
1 answer:
Maksim231197 [3]3 years ago
5 0

The values of (x, y) are (-5, 1), if the equations x-5y=-10 and -x+y=6 are solved by elimination method.

Step-by-step explanation:

The given is,

                      x-5y=-10................................(1)

                    -x+y=6.....................................(2)

Step:1

           Equation (2) is multiplied by -1 ( Eqn (2) × -1 )

                      x-y=-6..................................(3)

Step:2

         Substrate the equation (1) and equation (3),

                                      x-5y=-10

                                        x-y=-6

          ( - )

         After the Subtraction equation becomes,

                   (x-x)+(-5y+y)=(-10+6)

                                (0)+(-4y)=(-4)

                                            -4y=-4

                                                 y=1

Step:3

           By using y value find value of x,

                                  x-5y=-10

                             x-(5)(1)=-10

                                           x=-10+5

                                           x=-5

Step:4

           Check for solution,

                                  -x+y=6

                              -(-5)+1=6

                                             6=6

           Both sides are equal so answer is corrected

Result:

         The values of (x, y) are (-5, 1), if the equations x-5y=-10 and -x+y=6 are solved by elimination method.

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James used substitution to solve this system of equations which equation could be the result of his first step?
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Answer: OPTION D.

Step-by-step explanation:

<h3> The compete exercise is: "James used substitution to solve this system of equations. Which could be the result of his first step</h3><h3> \left \{ {{2x+3y=12} \atop {y=x+1.5}} \right.\\\\\\A.y=2x+3y\\B.y=2x+3y+1.5\\C.2x+3x+1.5=12\\D.2x+3(x+1.5)=12 "</h3>

Given the sytsem of equations:

\left \{ {{2x+3y=12} \atop {y=x+1.5}} \right.

1-  Solve for one of the variables from any equation and substitute it into the other equation.

2- Solve for the other variable in order to get its value.

3-  Substitute this value  back into one of the original equations. and find the value of the other variable.

In this case youu can observe that the second equation is already solved for "y", therefore, in  order to use the Substitution Method, the first step is: Substitute the second equation into the first one.

Therefore, the  equation that could be the result of James' first step is:

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5 0
4 years ago
Read 2 more answers
Ch lists the steps in the correct order to find the median of this data set?
anygoal [31]

Answer:

  1. Put the numbers in order
  2. Cross off the high/low pairs
  3. Add the leftover numbers
  4. Divide the sum by 2

=================================================

Explanation:

The numbers sort to this

16, 18, 23, 24, 29, 30

Cross off the outer most values 16 and 30 to end up with this smaller set

18, 23, 24, 29

Then repeat to get this smaller set

23,24

We add up these numbers and divide the sum by 2

(23+24)/2 = 47/2 = 23.5

The median is 23.5

The last steps of adding and dividing by 2 only works if we have an even number of values in the original set.

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NemiM [27]

Answer:

y=2

Step-by-step explanation:

2x+5y=10

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3 years ago
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katovenus [111]

Answer:

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Step-by-step explanation:

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And if the velocity is negative (v<0), then our object will be moving <em>backwards</em>.

We want to find between which interval(s) is the object moving backwards. Hence, the second condition. Therefore:

v

By substitution:

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Solve. To do so, we can first solve for <em>t</em> and then test values. By factoring:

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Zero Product Property:

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So, the (only) interval for which <em>v</em> is <0 is the second interval: 1<t<4.

Hence, our answer is A.

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