Y = 4x2 + 6x - 1
Use the pq-formula:
x = -4/2 +- sqrt ((4/2)2 -(-1))
x = -2 +- sqrt((16/4) +1)
x = -2 +- sqrt(4 +1)
x1 = -2 + sqrt(5)
x2 = -2 - sqrt(5)
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3x + 6x +1 = 10 9x = 10 - 1 9x = 9 x = 1
x=4 y=1 Therefore, 6x+5y=? Just substitute, and get 6*4+5*1=29
If: 6x-4+7 = 5 Then: x = 1/3
x = 2, y = 1
6x - 9 + 2x + 1 = 8x -8