3c-d=30 (i) 5c-3d=10
(ii)
3c-30=d
put the value in
the second
equ
5c-3(3c-30)=10
5c-9c+90=10
4c=80
c=80/4
c=20
now
we have the value of c
we can put this value in any equ to
find the value of d or we can do this the long
way
3c-d=30
3c=30+d
c=30/3+d/3
c=10+d/3
puting
this value in the second
equ
5(10+d/3)-3d=10
50+5d/3-3d=10
50-10=-5d/3+3d
40=-5d/3+9d/3
(took L.C.M on the right side of equals
to)
40=4d/3
40x3=4d
120=4d
d=30
now
we have the value of d.
we can put the value of c and d in
any equation to check the answer.
(NOTE: This is the
substution method for the solution for simultaneous linear equations. We can also use
the comparison method and many more.)
No comments:
Post a Comment