Horizontal lines have equations of the form \(y = c\). Draw the graph of \(x = 3\). Mark some points on a grid which have an \(x\)-coordinate of 3, such as (3, 0), (3, 1), (3, -2). The points lie ...

Examples of equations of lines that ... this into the equation for all straight lines, \(y = mx + c\). If \(y = 3x - 1\) the gradient of the graph is 3. This means the gradient of the ...