MATHEMATICS MIDDLE SCHOOL

Which of these strategies would eliminate a variable in the system of equations?\begin{cases} -7x + 2y = 5 \\\\ 3x - 5y = -5 \end{cases}
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−7x+2y=5
3x−5y=−5
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Answers

Answer 1
Answer:

The solution for given equations -7x+2y=5 and 3x-5y=-5 are x = -0.517 and y = 0.6896.

Step-by-step explanation:

The given is,

                            -7x+2y=5..........................(1)

                              3x-5y=-5........................(2)

Step:1

         Equation (1) is multiplied by 5    ( Eqn(1) × 5)

                        -35x+10y=25.........................(3)

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

                          -6x+10y=10.........................(4)

Step:2

         Subtract the equation (3) and (4),

                            -35x+10y=25

                              -6x+10y=10

                ( - )

    (-35x+6x)+(10y-10y)=(25-10)

                                     -29x=15

                                          x = - (15)/(29)

                                          x = -0.517

          From the x value equation (2) becomes,

                     3(-0.517)-5y=-5

                          -1.551-5y=-5

                                       -5y = (-5+1.551)

                                       -5y= -3.449

                                            y =(3.449)/(5)

                                            y = 0.6898

Step:3

          Check for solution,

                               -7x+2y=5..........................(1)

    (-7)(-0.517)+(2)(0.6898)=5

                        3.619+1.3796=5

                                             5 = 5

Result:

         The solution for given equations -7x+2y=5 and 3x-5y=-5 are x= -0.517 and y = 0.6896.

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Answers

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Answers

Answer:

1,239

Step-by-step explanation:

This problem can be rewritten as 21 • (6.3 • 10 - 4)

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(3.9E-2)(2.3E6) and (4.18E-4)(9E-4)​

Answers

Answer:

The required value of e is 10.

Step-by-step explanation:

 We are given to solve the following equation for the variable e :

To solve the given equation for e, we must take all the terms involving e on one side and the constant terms on the other side of the equation.

The solution of equation (i) is as follows :

Thus, the required value of e is 10.

Answer:

a

Step-by-step explanation:

How do I factor out the coefficient of the variable -5p+20

Answers

-5(p-4)

think of dividing each term by whatever you're factoring out, so the -5/-5 becomes a 1, and the +20/-5 becomes -4

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Answers

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Answer:

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Step-by-step explanation:

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Answers

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