y=3x - 4
To write a linear function, apply the formula y = mx + c
where m is the slope and c is the constant( the constant difference or ratio between any two consecutive points on the graph)
first, find the slope of the graph, then look for the value of constant. Then simply put them in the formula and you have the equation of the graph or function.
the constant can be found directly simply by looking at the increase or decrease in y value between two consecutive points on a linear graph.