Question

tell which value of the variable is the solution of the equation.
28 = 4d; d = 5, 7, 8, 9

which of the following is the solution of the equation?
a. 7
b. 9
c. 5
d. 8
e. no solution is given in the set of values.

Explanation:

Step1: Test d = 5

Substitute \( d = 5 \) into \( 4d \): \( 4\times5 = 20 \). Since \( 20
eq28 \), \( d = 5 \) is not a solution.

Step2: Test d = 7

Substitute \( d = 7 \) into \( 4d \): \( 4\times7 = 28 \). Since \( 28 = 28 \), \( d = 7 \) is a solution.

Step3: Test d = 8 (optional, as we found a solution)

Substitute \( d = 8 \) into \( 4d \): \( 4\times8 = 32 \). Since \( 32
eq28 \), \( d = 8 \) is not a solution.

Step4: Test d = 9 (optional, as we found a solution)

Substitute \( d = 9 \) into \( 4d \): \( 4\times9 = 36 \). Since \( 36
eq28 \), \( d = 9 \) is not a solution.

Answer:

A. 7