-3a-4b+2c=28
a+3b-4c=-31
2a+3c=11

a=-2

b=3

c=5

Step-by-step explanation:

I assume you want us to solve for te values of a, b, and c

since the last equation has eliminated b, we will eliminate b in the other 2 equations to solve

-3a-4b+2c=28

a+3b-4c=-31

eliminate b

lcm of 3 and -4 is -12 because that's math

multiply first equation by 3 and 2nd by 4 to get

-9a-12b+6c=84

4a+12b-16c=-124

add the equations together

-9a-12b+6c=84

4a+12b-16c=-124  +

-5a+0b-10c=-40

-5a-10c=-40

divide both sides by -5

a+2c=8

now compare this to the 3rd equation

a+2c=8 and 2a+3c=11

eliminate a from both equations

multiply first equation by -2

-2a-4c=-16

add this to other equation

-2a-4c=-16

2a+3c=11 +

0a-c=-5

-c=-5

c=5

subsitute back

a+2c=8

a+2(5)=8

a+10=8

a=-2

subsitute way back to find b

a+3b-4c=-31

-2+3b-4(5)=-31

-2+3b-20=-31

3b-22=-31

3b=9

b=3

a=-2

b=3

c=5

u rich

step-by-step explanation:

answer:

it is general formula that is used to write value to its excet position

a11 a12 a13

a21 a22 a23

it is the example of order 2 by 3 matrix in this

a11 means value occur in 1 st row 1st column

a12 means value occurs in 1st row 2nd column

a13 means value occur in 1st row and 3rd column

a21 means value occurs in 2nd row and 1st column

a22 means value occurs in 2nd row and in 2nd column

a23 means value occurs in 2nd row and in 3rd column