Question

doing process of elimination need the solution to;
4A+4B=24
-4A+B=21
PLEASE HELP

Answer 1

add the two equations together and solve for B

Answer 2

DID THAT ENDED UP WITH 9

Answer 3

5B=45 so B=9, now use either equation to get A.

Answer 4

substitute B=9 in the equation then solve for A

Answer 5

THIS IS WHERE I GET LOST I CANT FIGURE IT OUT FROM THERE????

Answer 6

-4A+B=21 then sub B=9 , -4A+9=21...

Answer 7

A IS -3 THEN????

Answer 8

is that right?

Answer 9

-4A=21-9, -4A=12,A=12/-4,A=-3. Yippy

Answer 10

YAY

Answer 11

SO IN MY SOLUTION WOULD BE (-3,15/4) IS THAT RIGHT??

Answer 12

dunno

Answer 13

Too check your answer, put A=-3,B=9 into both equations,
-4A+B=21, -4(-3)+9=21,21=21. The last equation is an identity statement. It is a "true" statement. So you just proved that A=-3,B=9 is a solution of this equation. Next you need to do the same for the other equation. It MUST also work there.

Answer 14

is this schoolwork????????????????????

Answer 15

The solution of a system of equations is the set (group) of all pairs (A,B) that satisfy the system. (what I did above is how you show that the system is satisfied).

so your answer is the pair (A value, B value)

Answer 16

OH thank you so much now that you have explained the second part i get it!!!!