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Leno4ka [110]
3 years ago
9

B = -1-7ab=−1−7a I need help with this question

Mathematics
1 answer:
Elan Coil [88]3 years ago
8 0

b = -1-7ab=−1−7a

Can be rewritten to be easier to understand.

b = -1-7ab\\-1 -7a = -1-7ab

In addition you can say the following equation is valid due to the way your problem was given to you.

b = -1-7a

Of course, you can simplify equation 2

-1-7a = -1-7ab\\-7a = -7ab\\a = ab\\1 = b\\b = 1\\

This ends up giving you b so you don't end up having to do any substitution in order to find b. Now substitute the value for b into either equation. I'm choosing the third because it's easiest.

b = -1-7a

1 = -1 -7a\\2 = -7a\\-\frac{2}{7} = a\\a = -\frac{2}{7}

And there you go :)

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