debiaso2005amd debiaso2005amd

10-02-2020
Mathematics

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Find a solution for 5x+4y=-30 and 3x-9y=-18

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guskarose guskarose

10-02-2020

{5x + 4y = -30

{3x - 9y = -18 | : 3

{5x + 4y = -30

{x - 3y = -6 | + 3y

{5x + 4y = -30

{x = 3y - 6

{5(3y - 6) + 4y = -30

{x = 3y - 6

{15y - 30 + 4y = -30 | + 30

{x = 3y - 6

{19y = 0 | : 19

{x = 3y - 6

{y = 0

{x = 3 · 0 - 6

{y = 0

{x = -6

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