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24-03-2018
Mathematics

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

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edyg144 edyg144

24-03-2018

[tex](9x + 10y = 29)9[/tex]
[tex](10x + 9y = 28) - 10[/tex]

[tex]81x + 90y = 261[/tex]
[tex] - 100x - 90y = - 280[/tex]
[tex] - 19x = - 19[/tex]
[tex]x = 1[/tex]
[tex]9(1) + 10y = 29[/tex]
[tex]9 - 9 + 10y = 29 - 9[/tex]10y=20
y=2

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