2 years ago

How to solve y-x=0 and 7x-9y=8 by substitution

Mathematics

1 answer:

aleksandr82 [10.1K]2 years ago

5 0

With y-x=0, add x to both sides to get y=x.

Now you can substitute either x or y

7x-9x=8 or 7y-9y=8 which is the same thing

-2x=8 or -2y=8

x=-4 or y=-4

Hope this helped!

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