Question

which method involves solving one equation for one variable and substituting it into another equation?
a. matrix
b. substitution
c. elimination
d. graphing

what is a common real-world application of using systems of equations?
a. determining chemical formulas
b. solving geometry problems
c. calculating area
d. business and economic forecasting

Explanation:

1. The substitution method is defined by solving one equation for a variable and substituting that expression into the other equation in a system.
2. Systems of equations are commonly used in business and economics to model relationships between variables like supply/demand, costs, and revenue for forecasting and decision-making. The other options are more associated with single-discipline specific calculations rather than system of equations applications.

Answer:

1. b. Substitution
2. d. Business and economic forecasting