Y=-2x+8 find y if x is 6

2 answers:

7 0

$\text{Plug in 6 to the x variable in your equation to get your answer}\\\\y=-2(6)+8\\\\\text{Solve:}\\\\y=-2(6)+8\\\\y=-12+8\\\\\boxed{y=-4}$

vitfil [10]2 years ago

5 0

Answer:

When x is 6, y is -4

Step-by-step explanation:

Y = -2x + 8

Input x = 6:

Y = -2(6) + 8

Multiply:

Y = -12 + 8

Add:

Y = -4

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Step-by-step explanation:

<u>Exponential Function</u>

The exponential function can be written with the general equation:

$f(x)=A\cdot r^x$

Where A is the value when x=0 and r>0 is the ratio. If r is greater than 1, the function is increasing, if r is less than 1, the function is decreasing.

The table shows the relation between values of x and values of the function y. Note that as x increases (one by one), y decreases with a ratio of 1/2. Only the last two choices have ratios of r=1/2. We only have to test which one of them has the correct value of y=4 when x=0.

Substituting in the third function:

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$\displaystyle f(0)=4\cdot\left(\frac{1}{2}\right)^0$