2.
2x - 3y = 7
5x + y = 9
3.
2x + 3y = 8
2x = 2 + 3y
4.
0-2x + 0.1y = 25
2(x - 2) - 1.6y = 116
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solution of que no. 1 :-
let 2x - 3y = 7 be equation on 1st
nd 5x + y = 9 be eq 2nd
multiplying eq 2nd by 3
(5x + y = 9 ) x 3
= 15x + 3y = 27
nd let it be eq no. 3rd
from equation 1st nd 3rd we have
2x - 3y = 7
15x + 3y = 27
2x + 15x = 17x
-3y nd +3y will cancelled.
7 + 27 = 34
then.., we have
17x = 34
x = 34/17
x = 2
putting the value of x in eq no. 2
5x + y = 9
5(2) + y = 9
10 + y = 9
y = 9-10
Y = - 1
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