The equation which matches the information is b - 3n = 7 .
A linear equation only has one or two variables. No variable in a linear equation is raised to a power greater than 1.
Now, it is given that
Number of bolts stored = b
Number of nuts = n
Now since it is also given that b is 7 more than three times the number of nuts, n.
Therefore we can write,
b = 7 + 3n
taking variables to one side and constant to the other we obtain,
b - 3n = 7
Hence, the equation which matches the information is b - 3n = 7
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