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22-04-2020
Mathematics

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If x+y=10 and x - y = 11, what is the value of x - 72

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mirai123 mirai123

22-04-2020

Answer:

[tex]x+y=10\\\\x-y=11\\-y=11-x\\y=-11+x\\\\x+(-11+x)=10\\x-11+x=10\\2x=21\\x=10.5[/tex]

[tex]x-72\\10.5-72\\-61.5[/tex]

The answer is -61.5

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