How do you find the value of x so that the function n(x) = 7x +4 has the given value 39?

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How do you find the value of x so that the function n(x) = 7x +4 has the given value 39?

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Answer 1 · 2018-04-19T08:57:37

$x = 5$ $x=5$

Explanation:

the function has a value of 39 when n(x)=39, therefore we can substitute 39 instead of n(x) and solve for x

$n (x) = 7 x + 4$ $n(x)=7x+4$
$39 = 7 x + 4$ $39=7x+4$
$7 x + 4 = 39$ $7x+4=39$
$7 x + 4 - 4 = 39 - 4$ $7x+4-4=39-4$
$7 x = 39 - 4$ $7x=39-4$
$7 x = 35$ $7x=35$
$\frac{7 x}{7} = \frac{35}{7}$ $(7x)/7=35/7$
$x = 5$ $x=5$

you can check your answer by plugging the value of $x$ $x$ back into the original function and seeing if the n(x) value is 39

$n (x) = 7 x + 4$ $n(x)=7x+4$
$n (5) = 7 (5) + 4$ $n(5)=7(5)+4$
$n (5) = 35 + 4$ $n(5)=35+4$
$n (5) = 39$ $n(5)=39$

$:.$ the answer is correct

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How do you find the value of x so that the function n(x) = 7x +4 has the given value 39?

1 Answer

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