How do you work out the nth term for a linear equation?

For a linear sequence use DNA! This is a formula that can be used to work out the nth term. It is officially written as Dn+alets take an example: 3, 7, 11, 15, 19, 23The "D" stands for the difference between the values in a sequence.The "n" stands for the nth term in the sequence.and the a stands for the 0th term in the sequenceIn the example above D is equal to 4 as 7-3=4The 0th term can be worked out by taking away the difference from the first term. So from the example above 3-4=-1. n=-1So substituting into the equation Dn+a the nth term is 4n-1