SOLUTION: i'm not quite sure if this is evaluation of expressions, parentheses, i'm just confused! i'm in 7th grade pre algebra and i was wondering if you could help me. the homework i'm hav

Algebra ->  Expressions -> SOLUTION: i'm not quite sure if this is evaluation of expressions, parentheses, i'm just confused! i'm in 7th grade pre algebra and i was wondering if you could help me. the homework i'm hav      Log On


   

Question 135993: i'm not quite sure if this is evaluation of expressions, parentheses, i'm just confused! i'm in 7th grade pre algebra and i was wondering if you could help me. the homework i'm having troubele with is this for exameble...
3(3-y)+1=31 and 8x-11(x-2)=-1 theres alot more but those are just two on that page. also if you could walk me through the problem in a really simple way that would be awsome! i cant figure any of it out. i went to another homework helper and it was too complecated. haha. so if you could pleas please please help me soon that would be amazing
-confused
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
OK, let's go step by step.
The key is variables (x,y,z,etc.) on one side, everything else on the other side.
Usually variable on the left, everything else on the right.
3%283-y%29%2B1=31
3%283%29-3y%2B1=31Distributive property.
9-3y%2B1=31Simplify.
-3y%2B10=31Simplify.
-3y%2B10-10=31-10Subtract 10 from both sides of the equation.
-3y=21Simplify.
y=21%2F%28-3%29 Divide both sides by (-3).
y=-7 Simplify.
Go back to your original equation and verify.
3%283-y%29%2B1=31
3%283-%28-7%29%29%2B1=31
3%283%2B7%29%2B1=31
3%2810%29%2B1=31
30%2B1=31
31=31
Your answer led to a true statement.
It's a good answer.
Next one.
8x-11%28x-2%29=-1
8x-11x-11%28-2%29=-1Distributive property.
8x-11x%2B22=-1
-3x%2B22=-1
-3x%2B22-22=-1-22
-3x=-23
x=23%2F3
Check your answer.
8x-11%28x-2%29=-1
8%2823%2F3%29-11%28%2823%2F3%29-2%29=-1
8%2823%2F3%29-11%28%2823%2F3%29-6%2F3%29=-1
8%2823%2F3%29-11%2817%2F3%29=-1
184%2F3-187%2F3=-1
-3%2F3=-1
-1=-1
Your answer led to a true statement.
It's a good answer.
Hope that helps.
Let's me know if any areas need any clarification.