### Home > CCA > Chapter 4 > Lesson 4.2.5 > Problem 4-81

4-81.

Solve the following systems of equations using any method. Check each solution, if possible.

Use the Elimination Method.

Find

then input the answer into one of the equations above to find.

Use the Substitution Method. The equivalent of

is already given.and

Refer to parts (a) and (b) for help. Be aware of the

in the first equation.

Use the elimination method like in part (a).

Multiply the first equation by

.