Equations with solution x = 9 are:
81/x - 3 = 6
2x - 3 = 15
Step-by-step explanation:
To determine the equation whose result ives x = 9, we need to solve each of the equation in the question
a) 4 + 5x = 18
5x = 18 - 4
5x = 14
x = 14/5
This is not x = 9 (option is wrong)
b) 24 - 2x = 13
24 - 2x + 2x = 13 + 2x
24 = 13 + 2x
24 - 13 = 2x
11 = 2x
x = 11/2
This is not x = 9 (option is wrong)
c) x/3 + 7 = 8
x/3 = 8 - 7
x/3 = 1
x = 3(1) = 3
This is not x = 9 (option is wrong)
d) 3x + 2 = 25
3x = 25 - 2
3x = 23
x = 23/3
This is not x = 9 (option is wrong)
e) 81/x - 3 = 6
81/x = 6 + 3
81/x = 9
81 = 9x
x = 81/9
x = 9
This equation has the sloution x = 9
f) 2x - 3 = 15
2x = 15 + 3
2x = 18
x = 18/2
x = 9
This equation has the sloution x = 9