Solve the system by substituting
Question
Updated 6/4/2014 8:26:06 AM
Flagged by yeswey [6/4/2014 8:21:53 AM]
Original conversation
User: Solve the system by substituting

User: solve the system by substituting 2x+7y=27 and 2x-7y=-79

Question
Updated 6/4/2014 8:26:06 AM
Flagged by yeswey [6/4/2014 8:21:53 AM]
Rating
3
2x+7y=27 rearranging the equation:
2x = 27-7y (equation 1)
2x-7y=-79 (equation 2)
institute 2x in equation 2 using equation 1 the result is:
(27-7y)-7y=-79
27-14y=-79
-14y=-79-27 = -106
y = -106/-14 = 53/7
2x = 27-7(53/7) = 27-53 = -26
x = -26/2 = -13
The solution for the system 2x+7y=27 and 2x-7y=-79 is (-13, 53/7)
Confirmed by andrewpallarca [6/4/2014 12:37:58 PM]

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