Question

Which is the best first step when solving the following system of equations? x + y = 3. 4 x minus y = 7.

(A): Multiply the first equation by 4.
(B): Add the first equation to the second equation.
(C): Multiply the second equation by Negative 1.
(D): Subtract the second equation from the first equation.

Answer 1

• (B) Add the first equation to the second equation

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Given system:

• x + y = 3,
• 4x - y = 7.

The easiest first step is adding up the two equations that would eliminate y.

This is matching the second answer choice.