Question

is it necessary to rearrange the equation? for example, why was the third step... (some text and math expressions are partially visible, including equations like -9y - x = -5, -9y - 4 = -5, -9y + 4 = -5, \\(\frac{3x}{3} = \frac{-12}{3}\\), (x = -4))

Explanation:

This question relates to solving systems of linear equations via elimination. Rearranging equations is a key step to create opposite coefficients for a variable, which allows adding equations to eliminate that variable and solve for the remaining one. The other options do not align with the core purpose of this rearrangement in elimination method problems.

Answer:

Green option: To make the coefficients opposites