Question

6x + 4y = 21 and x - 4y = 6 using substitution method​

Answer 1

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Answer 2

Answer:

6x+4y=21.......(1)

x-4y=6.............(2)

By adding equation (1) and (2)

6x+4y=21

+ x-4y=6

7x+0=27

x=27/7

by substituting x=27/7 in equation (1)

6x+4y=21

6(27/7)+4y=21

162/7+4y=21

(162+28y)/7=21

162+28y=21×7

162+28y=147

28y=147-162

28y=-15

y=-15/28

(x,y)=(27/7,15/28)