Last week, the formula linear equation has been introduced to us. A linear equation refers to the equation of a straight line. There is a formula y=mx+b. m is equal to the slope and b is the y-axis. If there is a given graph and require us to find write out the equation, it’s easy by using the formula.

For example, in this graph, we can found out the slope by finding two points (0,1) (1,3) and using the slope formula the slope will be 2 and we can find out the b by looking at the point which the straight line and the y-intercept crossed together which is 1. The complete formula will be y=2x=1.