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2 years ago

Let f(x) = 2x - 3. If f(x) = 15, what is x?

1 answer:

5 0

To find the value of input value 'x' of the function substitute the value of output value f(x) in the given function.

If f(x) = 2x - 3 and we have to find the values of 'x' for f(x) = 15

Substitute the value of f(x) in the given function,

15 = 2x - 3

2x = 15 + 3

2x = 18

x = 9

If g(x) = 3x + 2
For g(x) = 11

11 = 3x + 2

3x = 11 - 2

3x = 9

x = 3

If w(x) = 3x - 7
For w(x) = 14

114 = 3x - 7

3x = 21

x = 7

If h(x) = -2x - 5
For h(x) = -25

-25 = -2x - 5

25 = 2x + 5

2x = 20

x = 10

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Knowing that second line passes through the points $(1,0)$ and $(0,-2)$ , you can graph it.

The solution of the system of equations is the point of intersection between the lines. Therefore, the solution of this system is:

$(2,2)$

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