Solve 4x+6y=21 7x-3y=3

Answer 1

well, you can see from the 2nd equation that 3y=7x-3. So, 6y=14x-6

Plug that into the 1st equation to find x, and then you can get y.

Or, equivalently, multiply the 2nd by two and then you have

4x+6y = 21
14x-6y = 6

Now just add the two equations and y vanishes, leaving

18x=27
...

Answer 2

Please explain further

Answer 3

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