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How do you solve this using elimination 7x plus 2y equals 10 and -7x plus y equals -16?
Wiki User
∙ 12y ago
7X + 2Y = 10
- 7X + Y = - 16
-----------------------just add
3Y = - 6
Y = - 2
--------------find X, top equation
7X + 2(- 2) = 10
7X - 4 = 10
7X = 14
X = 2
------------check both original equations for consistency; top first
7(2) + 2(- 2) = 10
14 - 4 = 10
10 = 10
------------top checks; now check bottom equation
- 7(2) - 2 = - 16
-14 - 2 = - 16
- 16 = - 16
------------------both check and are then consistent
Wiki User
∙ 12y ago
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