emman24 emman24

25-02-2020
Mathematics

contestada

what has the sum of 21 and the difference of 7 answer

Respuesta :

sami13006 sami13006

25-02-2020

Answer:

7

Step-by-step explanation:

x

+

y

=

21

x

−

y

=

7

y

=

21

−

x

x

−

(

21

−

x

)

=

7

x

−

21

+

x

=

7

2

x

=

28

x

=

14

∴

14

+

y

=

21

y

=

7

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