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agasfer [191]
3 years ago
15

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

Mathematics
1 answer:
Dahasolnce [82]3 years ago
3 0

{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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