MulkyAbdi MulkyAbdi

29-01-2018
Mathematics

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Is a= -2 a solution to 7= a -9

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iiKajanaii iiKajanaii

29-01-2018

No

[tex]7 = a - 9[/tex]
add 9 to both sides
[tex]7 + 9 = a - 9 + 9 \\ 7 + 9 = a \\ 16 = a \\ a = 16[/tex]

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29-01-2018

Substitute a=-2 into 7=a-9 and will get 7=-2-9 so 7=-11 so since this is not true
a=-2 in NOT a solution for 7=a-9

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