SOLUTION: Please explain multi step equations to me because i dont understand it at all. I am in the 7th grade in advanced math and i am doing pre algebra. Also when you are doing a multi st

Algebra ->  Equations -> SOLUTION: Please explain multi step equations to me because i dont understand it at all. I am in the 7th grade in advanced math and i am doing pre algebra. Also when you are doing a multi st      Log On


   

Question 218470: Please explain multi step equations to me because i dont understand it at all. I am in the 7th grade in advanced math and i am doing pre algebra. Also when you are doing a multi step equation and you have an subtraction sign do you change it and then change the sign of the next number? EX. 4p+5-7p=-1 would i change the subtraction sign between the 5 and the 7 to an addition sign and then change the positive 7 to a negative 7? My teacher told us that but that makes me more confused! HELP!
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
1/6(y+42)-15=-3
y/6+42/6-15=3
y/6+7-15=3
y/6=3-7+15
y/6=11
y=66 ans.
Proof:
1/6(66+42)-15=3
1/6*108-15=3
108/6-15=3
18-15=3
3=3
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4p+5-7p=-1 before changing signs try to combine like terms.
4p-7p+5=-1
-3p+5=-1 now subtract 5 from both sides
-3p+5-5=-1-5
-3p=-6 divide both sides by -3
-3p/-3=-6/-3
p=2 ans.
Proof:
4*2+5-7*2=-1
8+5-14=-1
13-14=-1
-1=-1