Question

Q-9 Find the solution set of x + y = 5, 2 x - y = 7
a. (1,4) b. (2,3) c. (4,1) d. (1,4)

Answer 1

x+y=5...1
2x-y=7...2
from ...1 we can say x=5-y...3
subst...3 in ...2
2(5-y)-y=7
10-2y-y=7
10-3y=7
-3y=-10+7
y=-10+7/-3
y=1
thn subst y=1 ...3
x=5-1
=4
(4,1)