If 15x+17y=21 and 17x+15 y=.find x+y
Answers
Answered by
8
Answer:
15x+17y=21 .....(1)
17x+15y=11 .....(2)
17×eqn(1)−15× eqn(2) gives
255x+289y−255x−225y=357−165
⇒64y=192
⇒y=
64
192
=3
Substitute the value of y=3 in (1) we get
15x+17×3=21
⇒15x=21−51=−30
∴x=
15
−30
=−2
Hence x=−2,y=3
And x+y=−2+3=1
Answered by
4
Answer:
15x+17y=21 .....(1)
17x+15y=11 .....(2)
17×eqn(1)−15× eqn(2) gives
255x+289y−255x−225y=357−165
⇒64y=192
⇒y=
64
192
=3
Substitute the value of y=3 in (1) we get
15x+17×3=21
⇒15x=21−51=−30
∴x=
15
−30
=−2
Hence x=−2,y=3
And x+y=−2+3=1
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and pls give the working also of the question u just solved of coordinate geometry
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