3x - y =10 , x-3y =18 find the value of x- y
Answers
Answered by
5
Answer:
3x-y = 10 ...........(1)
x-3y = 18..........(2)
by multiplying 3 in (1) and substracting ,we get
9x-3y = 30
x-3y = 18
- + -
---------------------
8x = 12
X = 12/8 = 4/3
by putting the Value of X in (1) , we get
3*4/3 - y = 10
4- y = 10
- y = 6
y = -6
now,
x-y = 4/3-(-6)
= 4/3+6
= 4+18/3
= 22/3....
hope it helps.....
plz follow...
Answered by
2
SOLVING
3x -y=10...........(I)
x-3y=18
(multiplying by 3 on both sides)
3x-9y=54...........(.II)
now from equations (I) and (II), applying elimination......
3x-y=10
3x-9y=18
(-). (-). (-)
__________
8y=-8
y=-1
and ...now putting y=-1 in equation (I)..we get
X=[10+(-1)]/3
X=3
therefore
x-y=3-(-1)=4
Similar questions