### Home > PC3 > Chapter 4 > Lesson 4.1.1 > Problem 4-19

4-19.

Solve the system:

Rewrite the second equation as:

Substitute the expression for from Step 1 into the top equation.

4-19.

Solve the system:

Rewrite the second equation as:

Substitute the expression for from Step 1 into the top equation.