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How do you solve this linear system - 9x plus 2y equals 5 and 7x plus 7y equals - 4?
-9x + 2y = 5 (1)
7x + 7y = -4 (2)
Mutiply first equation by 7 and second equation by 2
-63 x + 14 y = 35 (3)
14 x + 14 y = -8 (4)
eq 4 minus eq 3 gives:
77 x = - 43 accordingly x = - 43/77
Substitute x in eq (1):
-9 (-43/77) + 2y = 5
2y = 5 - (9)(43)/77 = (385-387)/77 = -2/77
y = -1/77
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