x2-5x = 24
x2-5x-24 = 0
(x-8)(x+3) = 0
x = 8 or x -3
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24 = 42
3 x ? =24
2y = 4x - 16 5y = 4x + 8 Subtract the first equation from the second: 3y = 24 so that y = 8 Substitute this into the first equation: 16 = 4x - 16 ie 32 = 4x so that x = 8 So the solution is (8, 8)
40 fl oz of the 16% solution and 24 of the other.
When x equals -8 and y equals 3, the expression -xy becomes -(-8)(3). Multiplying -8 and 3 gives us -24. Therefore, -xy equals -24 in this scenario.