Linear Equations in x and y

Remember

• The graph of an equation of the form $y=b$ is a horizontal line whose y-intercept is equal to b.
• The graph of an equation of the form $x=a$ is a vertical line whose x-intercept is equal to a.
• The graph of an equation of the form $Ax+By+C=0,$ where $A\ne 0$ and $B\ne 0,$ is a line that is neither horizontal nor vertical.