Unit 4 Review and some Factoring

Front

What does a dashed line represent in graphing inequalities?

Back

A dashed line indicates that the points on the line are not included in the solution set.

Front

What does a solid line represent in graphing inequalities?

Back

A solid line indicates that the points on the line are included in the solution set.

Front

How do you determine whether to shade above or below a line in a graph?

Back

If the inequality is 'y <' or 'y ≤', shade below the line. If it is 'y >' or 'y ≥', shade above the line.

Front

What is the solution to the system of equations: x - 3y = 13, 5x + 6z = 41, 2x + 4y - z = 5?

Back

(7, -2, 1)

Front

What is the value of x when you add the equations 2x + 4y - z = 5 and 5x + 6z = 41 together?

Back

x = -4

Front

What is the purpose of using matrices in solving systems of equations?

Back

Matrices provide a compact way to represent and solve systems of linear equations using row operations.

Front

What does the symbol '≥' indicate in an inequality?

Back

The symbol '≥' indicates that the value is greater than or equal to the number.

Front

What does the symbol '<' indicate in an inequality?

Back

The symbol '<' indicates that the value is less than the number.

Front

How do you graph the inequality y < 2x + 3?

Back

Graph the line y = 2x + 3 as a dashed line and shade below it.

Front

What is the first step in solving a system of equations using substitution?

Back

Isolate one variable in one of the equations.