Question

ASAP!!!!!
Analysis: For the given system, tell which equation you would first use to solve for a variable in the first step
of the substitution method. Explain your choice.
2.5x – 7y = 7.5
6.2 - y = 1

Answer 1

When using substitution, you want to solve an equation for one variable that doesn’t make the equation worse to work with.

The general idea is that you want to find a variable that has a coefficient of 1 or -1.

In 2.5x - 7y = 7.5, both variables have “bad” coefficients.

In 6.2x - y = 1, the y has a coefficient of -1. That’s where you want to start.