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Genrish500 [490]
3 years ago
9

7x + 4y = -3 -7x - 5y = 9 How do I solve using elimination

Mathematics
1 answer:
mel-nik [20]3 years ago
5 0

Answer:

X=3, y=-6

Step-by-step explanation:

7x+4y=-3 equation 1

-7x-5y=9 equation 2

     -y=6. Add above two equations    

      Y=-6

solve for x by inputting y value into either equation.

7x+4(-6)=-3

7x-24=-3

7x=21

x=3

check answer by inputting x and y values into either equation

-7x-5y=9

-7(3)-5(-6)=9

–21+30=9

9=9

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Solve the given system by the substitution method <br>5x + y 19 <br>7x-2y = 13​
lesya692 [45]

Answer:

x = 3 , y = 4

Step-by-step explanation:

5x + y = 19 --------- ( 1 )

=> y = 19 - 5x

7x - 2y = 13 ------------ ( 2 )

Substitute y in ( 2 ) :

                        7x - 2( 19 - 5x ) = 13

                        7x - 38 + 10x = 13

                        17x = 13 + 38

                        17x = 51

                           x = 3

Substitute x in ( 1 ) :

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                           5( 3 ) + y = 19

                            15 + y = 19

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4 years ago
Create an equation to solve for x using the trapezoid midsegment formula:
Serggg [28]

Answer:

Equation for x:    3x - 6 = \frac{2x - 1 + 25}{2}

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Step-by-step explanation:

The midsegment formula for a trapezoid is

GH = \frac{CD + FE}{2}

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GH = 3x - 6 = 3(9) - 6 = 3 = 27 - 6 = 21

4 0
3 years ago
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