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3 years ago

2 (4x+5)=90? can someone help?

Mathematics

2 answers:

Kazeer [188]3 years ago

6 0

So first you multiply 2 and 4x to get 8x. Then you multiply 2 and 5 to get 10. So the problem will look like:

8x+10=90

Then you subtract 10 on both sides of the problem to get:

8x=80

And then divide 8 on both sides to get

x=10

Nikitich [7]3 years ago

4 0

8x+10=90
-10. -10
8x=80
divide both sides by 8
x=10

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2 years ago

Despite booming new car sales with their cha-ching

Elena-2011 [213]

Answer to the 1st question: 8 years

Answer to the 2nd question: The year 2022

=======================================================

Further explanation:

x = number of years after 2008

y = average price of a new car

The prices are going up by $1250 per year on average. This is the slope because the slope is the rate of change. So m = 1250.

The y intercept is b = 30100 as this is the price in 2008.

This leads us to go from y = mx+b to y = 1250x+30100

Plug in x = 0 and you should get y = 30100.

Also, plugging x = 6 into the equation leads to y = 37600 to help confirm things.

-----------------

Next, we plug in y = 47600 and solve for x.

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This means 14 years after the year 2008 is when the average new car price will be $47,600.

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2 years ago

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3 years ago

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3 years ago