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pishuonlain [190]
3 years ago
8

Find x when y=6 in the literal equation 5x +4y =39

Mathematics
2 answers:
notka56 [123]3 years ago
7 0
If I did it right then x would equal 3.
ira [324]3 years ago
7 0
5x + 4(6) = 36
5x + 18 = 36
- 18 -18
5x = 18

5/5 18/5

X= 3.6
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A.
Reptile [31]

Answer:

The real zeros of f(x) are x = 0.3 and x = -3.3.

Step-by-step explanation:

Solving a quadratic equation:

Given a second order polynomial expressed by the following equation:

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This polynomial has roots x_{1}, x_{2} such that ax^{2} + bx + c = a(x - x_{1})*(x - x_{2}), given by the following formulas:

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x_{2} = \frac{-b - \sqrt{\bigtriangleup}}{2*a}

\bigtriangleup = b^{2} - 4ac

In this problem, we have that:

f(x) = x^{2} + 3x - 1

So

a = 1, b = 3, c = -1

\bigtriangleup = 3^{2} - 4*1*(-1) = 13

x_{1} = \frac{-3 + \sqrt{13}}{2*1} = 0.3

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8 0
3 years ago
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