Question

Solve the following pair of linear equations by the elimination method
a) x+y=5 and 2x -3y =4
b) 3x+4y =10 and 2x -2y 2
d) 1 and -3
c) 3x-5y-4 =0 and 9x= 2y +7

Answer 1

Answer:

ANSWER

Here,given

a=1

d=4−1=3

and,s

n

=287

Now,

s

n

=

2

n

(2a+(n−1)d)

⇒287=

2

n

(2×1+(n−1)3)

⇒287=

2

n

(2+3n−3)

⇒574=n(3n−1)

⇒574=3n

2

−n

⇒3n

2

−n−574=0

onsolvingthequadraticequaton