Question

If 7a + 3b = 205 and 3a +7b = 305 then what is a + b)

Answer 1

Answer:

b= 38

a= 13

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Answer 2

Answer:

multiply first equation with 3 and 2nd equation with 7

21a+9b=618

_21a+49b=2135

______________

0_40b=1517

_______________

.. b= _37.9..

from 1st equation

7a+3b=205

7a+3×_38=205

7a_114=205

7a=319

a=45

a+b=45_38=7

there fore a+b=7