SOLUTION: 4. Mary is reviewing her algebra quiz. She has determined that one of her solutions is incorrect. Which one is it? A. 2x + 5 (x-1) = 9, x = 2 B. p - 3(p-5) = 10, p = 2.5 C. 4

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: 4. Mary is reviewing her algebra quiz. She has determined that one of her solutions is incorrect. Which one is it? A. 2x + 5 (x-1) = 9, x = 2 B. p - 3(p-5) = 10, p = 2.5 C. 4       Log On


   

Question 340394: 4. Mary is reviewing her algebra quiz. She has determined that one of her solutions is incorrect. Which one is it?
A. 2x + 5 (x-1) = 9, x = 2
B. p - 3(p-5) = 10, p = 2.5
C. 4 y + 3 y = 28, y = 4
D. 5 w + 6 w - 3w = 64, w = 8
E. t - 2t - 3t = 32, t = 8
How can i solve this.?
Found 2 solutions by Earlsdon, solver91311:
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
You can solve this simply by substituting the value of the variable in the given equation.
A. 2x+5(x-1) = 9 Substitute x=2.
2(2)+5(2-1) = 9 Simplify the left side.
4+5(1) = 9
9 = 9 This one is correct.
You can do the others the same way.
Good luck!

Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!


Take each of the values given for the variables and substitute that value back into the associated equation. Do the arithmetic. If the equation was solved correctly, the resulting statement will be true.

For example:



Substitute:



True statement, hence A does NOT contain the error.

Do the rest of them the same way. One (and only one -- I checked) of them will be a false statement after you substitute.

John

My calculator said it, I believe it, that settles it