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Lerok [7]
3 years ago
14

Can someone help answer these for me? ill give brainliest, i really need to finish :(

Mathematics
1 answer:
Elden [556K]3 years ago
6 0

Answer:

Step-by-step explanation:

-8x + 2y = -4                                              12x - 3y = 4

y = -3x - 2                                                  y = 4x

sub                                                             sub

-8x + 2(-3x - 2) = -4                                    12x - 3(4x) = 4

-8x - 6x - 4 = -4                                          12x - 12x = 4

-14x = -4 + 4                                                0 = 4

-14x = 0                                                       NO SOLUTION

x = 0                                                      ========================

y = -3x - 2                                            -3 + 2y = 5

y = -3(0) - 2                                          -4x + y = 10...y = 4x + 10

y = -2                                                    sub

solution is : (0,-2)                                 -3 + 2(4x + 10) = 5

================                             -3 + 8x + 20 = 5

3x + 2y = 11                                              8x + 17 = 5

x + 2y = 9...x = 9 - 2y                              8x = 5 - 17

sub                                                           8x = - 12

3(9 - 2y) + 2y = 11                                     x = -12/8

27 - 6y + 2y = 11                                       x = -3/2

-4y = 11 - 27

-4y = -16                                                y = 4x + 10

y = -16/-4                                               y = 4(-3/2) + 10        

y = 4                                                      y = -12/2 + 10

                                                              y = -6 + 10

x = 9 - 2y                                                y = 4

x - 9 - 2(4)                                            solution (-3/2,4)

x = 9 - 8

x = 1

solution : (1,4)

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