#### Chapter 4 System of Linear Equations

**Section 4.2 LS in two Variables**

# 4.2.4 Exercises

##### **Exercise 4.2.14 **

Solve the following systems of linear equations using the substitution method:

- $3x+y=4$ and $-x+2y=1$,

- $-x+4y=5$ and $2x-8y=-10$.

##### **Exercise 4.2.15 **

Solve the following systems of linear equations using the addition method:

- $2x+4y=1$ and $x+2y=3$,

- $-7x+11y=40$ and $2x+5y=13$.

##### **Exercise 4.2.16 **

Solve the following system of linear equations graphically: $2x=2$ and $x+3y=4$.