SOLUTION: For what value of a is x=3 a solution to the equation x+3=ax+9.? A. 1.5 B. 1 C. -1 D. -1.5 E. -3

Algebra ->  Expressions-with-variables -> SOLUTION: For what value of a is x=3 a solution to the equation x+3=ax+9.? A. 1.5 B. 1 C. -1 D. -1.5 E. -3      Log On


   

Question 427937: For what value of a is x=3 a solution to the equation x+3=ax+9.?
A. 1.5
B. 1
C. -1
D. -1.5
E. -3
Answer by algebrahouse.com(1659) About Me  (Show Source):
You can put this solution on YOUR website!
Substitute 3, in for x, and solve for a:

x + 3 = ax + 9 when x = 3
3 + 3 = a(3) + 9 {substituted 3 in for x}
6 = 3a + 9 {combined like terms on left side}
3a = -3 {subtracted 9 from both sides}
a = -1 {divided both sides by 3}

C. -1
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