Question

solve by elimination method x-3y=7, 3x-3y=15​

Answer 1

answer:

explaination:

• x-3y=7

x-3y-7=0--------1

• 3x-3y=15

3x-3y-15=0-------2

(x-3y-7=0)-(3x-3y-15=0)

x-3y-7=0

-3x-3y-15=0

--------------------

-2x+0+8=0

-2x+8=0

-2x=-8

x=-8/-2

x=4

substitute x=4 in equation 1

x-3y-7=0

4-3y-7=0

-3-3y=0

-3y=0+3

-3y=3

y=3/-3

y=-1

therefore x=4

y=-1