The value of the unknown number b is 1.4.
Substitution is putting a specific value in a given variable.
According to the given question Six more than the product of a number and 4 is equal to 7 and we have to use b for the unknown number.
7 is 6 more than the product of 4 and b which can be numerically expressed as
7 = 6 + 4b...(i)
7 - 6 = 4b.
1 = 4b.
b = 1/4.
To check if it is correct or not we will substitute the numerical value of b.
in eqn (i).
7 = 6 + 4b
7 = 6 + 4×1/4
7 = 6 + 1
7 = 7.
learn more about substitution here :
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