Question

1. which method is best for systems where equations are already in slope-intercept form?

a. elimination using multiplication.
b. graphical analysis.
c. elimination using addition or subtraction.
d. substitution.

Explanation:

Slope-intercept form is $y=mx+b$, where one variable (usually $y$) is isolated. Substitution is ideal here because you can directly substitute the expression for $y$ from one equation into the other equation, eliminating a variable quickly to solve the system. Other methods like elimination or graphical analysis are less efficient for this specific form.

Answer:

d. Substitution.