Question

the solution of equations x+y=7.,2x-y=20 is which of the following​

Answer 1

Answer:

x=9

y=-2

(9,-2)

Step-by-step explanation:

x+y=7

9+(-2)=7

2x-y=20

2(9)-(-2)=18+2=20

hence, verified

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Answer 2

x+y=7 ..............(1)

2x+y=20 ........(2)

multiple eqution 1 by 2

2(x+y=7)

=2x+2y=14 .......(3)

substract equation 1 & 3

2x+2y=14

_

2x+ y= 7

__________

y = 7

plese y = 7 in eqution 1

x+y = 7

x + 7 = 7

x= 7-7

x = 0

therefore x = 1

(x,y) = (1,7)