Member of the Month

KilaTsunami
October, 2024

Online

Welcome to the Newschoolers forums! You may read the forums as a guest, however you must be a registered member to post. Register to become a member today!

Sorry,, math question

profile picture
skithesprings
Posts: 9086 - Karma: 1,349

so im reviewing for sat pssa and i cant find out how to do this

1 given the equations below, what is the value of b?

  -7a + b/4 = 25

    b + a = 13

 i keep getting -9.30 something but the answer is supposed to be 16...

please help!

Nov 29 2007 10:07PM
0 0
profile picture
doublexl
Posts: 8407 - Karma: 27
6
Nov 29 2007 10:08PM
0 0
profile picture
comeatmebro
Posts: 10720 - Karma: 66
since you want to know what B is, but you said it's supposed to be 16....what do you want to know?

do you wanna know how to solve for B or what?
Nov 29 2007 10:10PM
0 0
profile picture
JockinJLoads
Posts: 3480 - Karma: 6
a + b = 13
a = 13 - b

-7(13-b) + b/4 = 25

-91+7b+(b/4) = 25

7.25b = 116

116/7.25 = 16 = b
Nov 29 2007 10:11PM
0 0
profile picture
skithesprings
Posts: 9086 - Karma: 1,349
jea^
Nov 29 2007 10:11PM
0 0
profile picture
skithesprings
Posts: 9086 - Karma: 1,349
madd plus karma for you  thanks!!!!!!!
Nov 29 2007 10:12PM
0 0
profile picture
Geoff.
Posts: 2378 - Karma: 12
A=13-b     Plug 13-b in place of A in the first equation and simplify
Nov 29 2007 10:13PM
0 0
profile picture
comeatmebro
Posts: 10720 - Karma: 66
fuck i shoulda just done it instead of asking questions hahaha.
Nov 29 2007 10:13PM
0 0
profile picture
Geoff.
Posts: 2378 - Karma: 12
Damn! beat me to it.
Nov 29 2007 10:14PM
0 0
All times are Eastern (-5)