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Kaylis [27]
3 years ago
12

Solving linear system, substitution 20x-30y=-50 x+2y=1 HELP PLEASE

Mathematics
1 answer:
hjlf3 years ago
6 0
20x -  30y = -50 ⇒ 20x -  30y = -50
    x +   2y = -1   ⇒ <u>20x + 40y = -20</u>
                                       <u>-70y</u> = <u>-30</u>
                                        -70     -70
                                            y = ³/₇
                           20x - 30(³/₇) = -50
                             20x - 12⁶/₇ = -50
                             <u>      + 12⁶/₇  + 12⁶/₇
</u>                                        <u>20x</u> = <u>47¹/₇
</u>                                         20<u />       20<u>
</u>                                            x = 2⁷/₂₀
                                      (x, y) = (2⁷/₂₀, ³/₇)
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