Question

elimination method
For 7x-y=42 and 3x-y=-6​

Answer 1

Step-by-step explanation:

7x - y = 42

3x- y = - 6

7x= 42 + y

x = (42 + y/ 7 )

3(42 + y / 7 ) - y = - 6

126 + 3 y / 7 - y / 1 = -6

126 + 3 y -7y / 7 = - 6

126 - 4y = -6 × 7

-4y = - 42/ 126

.

-4y = 7/ 21

y = - 7 / 21 +4

y = -7 + 84 / 21

y = 77/ 21

y = -7 / 21 + 4

y = -7 + 84/ 21

y = 77/ 21

7x - ( 77 / 21 ) = 42

7x = 42 + 77 / 21

7x = 882 + 77 / 21

7 x = 959 / 21

x = 959 × 7 / 21

x = 67.1321

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Answer 2

Answer:

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