algebra check please
posted by marko on .
help i am stuck :
8  5y = 12  9y
i got:
812 5y = 1212  9y
20  5y = 9y
20 +20  5y  9y
im so stuck idont understand this one can you please help me

8  5y = 12  9y
5y + 9y = 12 + 8
4y = 20
y = 5 
thanks and to check
8 5(5) = 12 9 (5)
825 = 12  45
33 = 33 true
thanks
got time for 1 more  please :)
8  3 (p4) = 2p
i got:
8  3p  12 = 2p
now im stuck 
You're welcome.
8  3 (p4) = 2p
8  3p + 12 = 2p
20 = 2p + 3p
20 = 5p
4 = p
You seem to be forgetting that multiplying two negative numbers produces a positive number. Watch your signs! 
wait i think i got it:
8  3p 12 = 2p
12 + 8 = 20
20  3p = 2p
+3p = +3p
20 = 5p

5 5
4 = p is that right 
Yay! You've got it!

thank you i really glad you cheked my work i feel better now. its clicking
thanks and good night