Question

Using elimination, substitution solve A
A. 3x - 9y = 3
6x - 3y = (-24)

Answer 1

@hereweg0

Answer 2

it belongs in the math section

Answer 3

but okay.
3x - 9y = 3
lets get x alone. 3x=3+9y

Answer 4

yeah i dont care

Answer 5

1)Elimination by coefficient method
3x - 9y = 3 .....( i )
6x - 3y = - 24 ...( ii )

Multiplying ( i ) by 2,we get
6x - 18y = 6 .... ( iii )

Subtracting ( ii ) from ( iii ),we get
6x - 18y = 6
6x - 3y = - 24
(-) (+) (+)
---------------------
- 15y = 30
y = - 2

Substituting y = - 2 in ( ii ),we get
6x - 3(- 2) = - 24
6x + 6 = - 24
6x = - 30
x = - 5

x = - 5 and y = - 2 is the solution of given simultaneous equations.

2)Substitution method
3x - 9y = 3
Dividing throughout by 3,we get
x - 3y = 1
x = 1 + 3y ..... ( i )
6x - 3y = - 24 .....( ii )
Substituting ( i ) in ( ii ),we get
6(1 + 3y) - 3y = - 24
6 + 18y - 3y = - 24
15y = - 30
y = - 2

Substituting y = - 2 in ( i ),we get
x = 1 + 3y
x = 1 + 3(- 2)
x = 1 - 6
x = - 5

x = - 5 and y = - 2 is the solution of given simultaneous equations.

According to me both the methods are efficient and easy.
It varies from individual to individual to decide which method is efficient.
So my opinion to you is that learn both the methods and practice hard and try to master them.

!!!HOPE I HELPED!!!!

Answer 6

belong in math

Answer 7

hmm nice haha

Answer 8

this is science....

Answer 9

Thanks kasim17