Question

When solving this system of linear equations with the elimination method, you can multiply the bottom equation by 3.

Answer 1

Answer: A - Multiplication property of equality

Still the correct answer on APEX as of 4/29/19.

Answer 2

Answer: The correct option is A.

Explanation:

The system of equations is,

$3x+6y=38$

$5x-2y=-30$

When solving this system of linear equations with the elimination method, we can multiply the bottom equation by 3.

$3(5x-2y)=3(-30)$

This step works because according to the multiplication property of equality,

If,

$a=b$         ... (1)

Multiplied both side by m then,

$ma=mb$    ..... (2)

Then (1) and (2) are equivalent equations.

So, by multiplication property of equality, the second equation can be multiply by 3.

Therefore, he correct option is A.