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Solve Systems by Substitution
2x+5y=-3
x+8y=4
and
2x+y=7
x-2y=-14

Sagot :

Panoyin
2x + 5y = -3 ⇒ 2x +   5y = -3 
1x + 8y =  4 ⇒ 2x + 16y = 8
                              -11y = -11
                                -11     -11
                                    y = 1
                        2x + 5(1) = -3
                            2x + 5 = -3
                                  -5     -5
                                  2x = -8
                                   2      2
                                    x = -4
                              (x, y) = (-4, 1)

2x + 1y = 7     ⇒ 2x + 1y = 7
1x -  2y = -14 ⇒ 2x  - 4y  = -28
                                   5y = 35
                                    5      5
                                     y = 7
                             2x + 7 = 7
                                   -7   -7
                                   2x = 0
                                    2     2
                                    x = 0
                              (x, y) = (0, 7)
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