Question

From the set {77, 78, 79}, use substitution to determine which value of x makes the equation true. 3x = 231

Answer 1

77

Explanation:

Substitution pretty much involves replacing a value (in this case, the letter x) with another value (from the set).

To make 3x = 231 true, we have to replace x with each element in the set and see if the equation holds.

{77, 78, 79}

77

3(77) = 231 This is correct

78

3(78) = 234 This is incorrect!

79

3(79) = 237 This is incorrect!