4n + 3 = 15
4n +3 - 3 = 15 - 3
4n = 12
4n/4 = 12/4
n = 3
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6n -3=2n+9 6n-2n=9+3 4n=12 n=12/4 n=3
The nth term IS 4n + 3 ie 4 times n and then add 3.
The answer is n = 5.
10x + 3 = 15 10x = 15 - 3 10x = 12 x = 1.2
5 + -8 = 3 + 12 -3 is not equal to 15