SOLUTION: I'm trying to help my 8th grade son with homework equations and I'm totally confused (as he is). I'm sure if you show me step by step I'll be able to figure out some of the other

Algebra ->  Equations -> SOLUTION: I'm trying to help my 8th grade son with homework equations and I'm totally confused (as he is). I'm sure if you show me step by step I'll be able to figure out some of the other       Log On


   

Question 63407: I'm trying to help my 8th grade son with homework equations and I'm totally confused (as he is). I'm sure if you show me step by step I'll be able to figure out some of the other problems.
Problem 1: 7m + 4 - 15m = 36
I've tried the following steps:
7m +4 - 4 - 15m = 36 - 4
7m - 15m = 32 (and I'm super lost)
Problem 2: (2y + 5)- (y + 3) + (7y - 3y) = 17
Problem 3: 2 [k + 3 (k - 1)] = 18
Problem 4: -4.5 = 5n - n - n
Answer by Cintchr(481) About Me  (Show Source):
You can put this solution on YOUR website!
Great start to #1
Picking up where you left off ....
+7m+-+15m+=+32+
add the m terms
+-8m+=+32+
divide by -8
+m+=+-4+

2. +%282y+%2B+5%29-+%28y+%2B+3%29+%2B+%287y+-+3y%29+=+17+
distribute the understood -1 with the second quantity and get rid of the ( )
+2y+%2B+5+-1y+-3+%2B+7y+-3y+=+17+
add all the y values
+5y+%2B+5+-+3+=+17+}
add the constants
+5y+%2B+2+=+17+
subtract 2 from both sides
+5x+=+15+
divide by 5
+x+=+3+

3. +2%28k+%2B+3%28k+-+1%29%29+=+18+
Start with distributing the 3
+2%28k+%2B+3k+-+3%29+=+18+
Add like terms within the ( )
+2%284k+-3%29+=+18+
Distribute the 2
+8k+-6+=+18+
add 6 to both sides
+8k+=+24+
divide by 8
+k+=+3+

4. +-4.5+=+5n+-+n+-+n+
add like terms on the right
+-4.5+=+3n+
divide by 3
+-1.5+=+n+