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solving linear system, substitution

20x-30y=-50
x+2y=1

HELP PLEASE

Sagot :

Panoyin
20x -  30y = -50 ⇒ 20x -  30y = -50
    x +   2y = -1   ⇒ 20x + 40y = -20
                                       -70y = -30
                                        -70     -70
                                            y = ³/₇
                           20x - 30(³/₇) = -50
                             20x - 12⁶/₇ = -50
                                   + 12⁶/₇  + 12⁶/₇
                                        20x = 47¹/₇
                                         20       20
                                            x = 2⁷/₂₀
                                      (x, y) = (2⁷/₂₀, ³/₇)
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