ugghhh im so confused with math!?

Question

i totaly forget how to combine like terms, its worse then it seems, i need to do this homework because my dads always on my *** about things im like for real about to cry bcv i dunno how to do it and all the sites i go to dont help...well heres some of what i have to do....

7y=2y-15

9x=2x+15

99+6u=-3u

13d+25=8d

7u-2u=3u+22

17p+p=40-2p

2m-21=9m+7

18n+12=27n+3

15b-8=31b+24

3(z+5)=8z

5(4-7u)= -u-48

7(3-u)+u=5-2u

5(1+c)=6(2+c)

5(x+7)=6(x-5)

6(2x-1)= -5(3x-15)


THANK YOU

Answer 1

okay to combine like terms just add or subtract the things with the same "letter"
for example for 7y=2y-15 you wud subtract 2y from both sides of equation and make it 7y - 2y = - 15
then u do 5y=15
and divide both sides by 5
and ur answer is y=3

9x=2x + 15 ( same method) start by subtracting 2x from both sides
7x=15
x=15/7

99+6u=3u
-3u=99
u=-22

13d + 25 = 8d
25 = -7d
d=-7/25

7u-2u=3u+22
2u=22
u=11

17p+p=40-2p
20p=40
p=2

2m-21=9m+7
-7m=28
m= -4

18n+12=27n+3
9=9n
n=1

15b-8=31b+24
-16b=32
b=-2

3(z+5)=8z
3z + 15 = 8z
15 = 5z
z=3

5(4-7u)= -u-48
20 - 35u = -u - 48
34u = 28
u=28/34


i think u can do the rest on ur own now...
Good luck and don't worry - i think ur dad's just trying to help u coz he worries abt u and if he does get annoying then maybe u shud tell him how u feel and he might understand - u cud also ask him for help and just say that ur having a bad day and u cant quite remember wat ur supposed to do with like terms....

Hope this helps!!

Answer 2

You want to isolate the variable and then subtract the Number from the variable from the number on the opposite side of the equal sign.

example- 7y+=2y-15 so you would change that to 5y=-15 and then divide 5 from both sides to get y=-3.