if x is 10 and y is 16 then what is x+y
Answers
Answer:
Given:
x + y = 10
x.y = 16
Working
If x.y = 16
Then y = 16/x
Substitute for y in x + y = 10
Therefore x + 16/x = 10
Multiply throughout by x
Therefore
x2 + 16 = 10x (note by writing x2 I mean x-squared)
Subtracting 10x from each side of the equation gives
x 2 - 10x + 16 = 0
Solving the quadric equation gives factors
(x - 8) (x-2) = 0
Either (x-8) = 0
Or (x-2) = 0
(because one of those factors has to be zero to give a product of zero on RHS of equation)
Solution is
x = 8 or x = 2
Step-by-step explanation:
Given:
x + y = 10
x.y = 16
Working
If x.y = 16
Then y = 16/x
Substitute for y in x + y = 10
Therefore x + 16/x = 10
Multiply throughout by x
Therefore
x2 + 16 = 10x (note by writing x2 I mean x-squared)
Subtracting 10x from each side of the equation gives
x 2 - 10x + 16 = 0
Solving the quadric equation gives factors
(x - 8) (x-2) = 0
Either (x-8) = 0
Or (x-2) = 0
(because one of those factors has to be zero to give a product of zero on RHS of equation)
Solution is
x = 8 or x = 2
Answer:
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Step-by-step explanation:
given,
x equals 10, y equals 16
ATQ,
x + y
10 + 16
26