what is the anwer for this problem and the steps for solving future problems? 4y-2=6y+6. 5a-5=7+2a. 5+-5=5r+7.

Question

it is 3 step equation solving that im learning in the 8 grade. im having alot of trouble. need help immediately due november 2 , 2011.

Answer 1

These are 3 separate equations:

4y - 2 = 6y + 6

subtract 4y from both sides:

-2 = 2y + 6

subtract 6 from both sides:

-8 = 2y

divide both sides by 2:

-8/2 = y y = -4

 

5a - 5 = 7 + 2a

subtract 2a from both sides:

3a - 5 = 7

add 5 to both sides:

3a = 12

divide both sides by 3:

a = 12/3 = 4

 

5 + (-5) = 5r + 7

subtract 7 from both sides:

-7 = 5r

divide both sides by 7:

r = -7/5