a + b = c Write a true equation . Write a false equation. For example: a is 7 , b is 3, c is 10 7+3 = 10 (true equation) a is 7,
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The answer is D, i.e. the system was solved via elimination
If you multiply the first equation by 5, the system becomes
If you sum the two equations, you get
And so if you substitute the second equation of system A with this new equation, you'll get system B.