(b)
3x + y = 2
4x - 7y = 3
frnds plz help me to solve this by graphical or algebraic method
Answers
Answered by
1
Answer:
Algebrically.
it can be done by elimination method.
3x+y = 2......(1)
4x-7y= 3......(2)
(1)×4=12x+4y=8......(3)
(2)×3=12x-21y=9......(4)
(3) - (4)
=12x + 4y = 8....(3)
12x - 21y = 9....(4)
....................................
= -17y = -1
y = -1/-17
y = 1/17
now, put y=1/17 in (1)...
= 3x + 1/17 = 2
= 17(3x) + 1/17 = 2
= 51x +1/17 = 2
= 51x + 1 = 2×17
= 51x + 1 = 34
= 51x = 34-1
= 51x = 33
= x = 33/51
= 11/17
... Hence..,
x = 11/17
& y = 1/17
Similar questions