0
Anonymous
4a - 5b = 7
4a +5b = 17
From the first equation:
4a = 7 + 5b
substitute this value in the second equation:
7 + 5b + 5b = 17
7 + 10b = 17
10b = 10
b = 1
Now,solve for a :
4a - 5(1) = 7
4a = 7 + 5
4a = 12
a = 3
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8b -2a
(4, 3)
5b = 21 + 4b 5b - 4b = 21 + 4b - 4b b = 21
b= -162
5b + 5b = 2 x 5b