4 years ago

9x+10y=29 10x+9y=28 Solve by elimination

1 answer:

7 0

$(9x + 10y = 29)9$
$(10x + 9y = 28) - 10$

$81x + 90y = 261$
$- 100x - 90y = - 280$
$- 19x = - 19$
$x = 1$
$9(1) + 10y = 29$
$9 - 9 + 10y = 29 - 9$ 10y=20
y=2

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