Question

​ ​ −3x−9y=18 4x+3y=12 ​

Answer 1

Solve using elimination method it's pretty easy

Answer 2

Answer:

Step-by-step explanation:

we have what is called simultaneous equation which is made up of substitution and elimination.

Substitution is used when one of the co-efficient of the unknown is 1. example:3x+y = 1 and 2x-3y = -8 in such equations substitution method is required.

Elimination method is used when none of the co-efficient of the unknown is 1. example: 7x+4y= 27 and 4x+3y= 14 in such equations elimination method is used.

worked example

-3x-9y=18.........1

4x+3y=12 .........2

solution

equ 1(x4

equ 2(x3

-12x-36y=72.........3

12x+9y=36.............4

27y=36

y=1.3333

y=1.3

       

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