I am going to explain this using the substitution method, considering it appears to be the best in this situation.

We know (from the bottom equation) that y can equal 3x+20. Using this knowledge, we substitute the y in the top equation for 3x+20. Now, we have an equation that looks like this:

3x+20=x^2+2x

Now we need to move x to one side and then do some radicals (square roots).
Subtract the 2x on the right (since it is smaller, negatives = NONONO), which will give you

x+20=x^2

Now, we take the square root of both sides to get

rad(x+20)=x

Now we have to simplify. 20 doesn't have a square root, but 4 goes into 20, and 4 has a square root of 2. This now becomes

2rad(x+5)

This doesn't simplify any further... we have a problem... no way to isolate x as far as my knowledge goes... Sorry, can't help you any further than that, but another person or your teacher might be able to. R.I.P...

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3 years ago

Denny had five kittens (K) that he wants to sell for $15.00 each.Tge cost to raise the kittens so far has been $10.00 each. What

madreJ [45]

Five kittens will give Denny $75.
Raising them cost $50.
So Denny will make a profit of $15.

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3 years ago

Read 2 more answers

What is the number 0.00000482 written in scientific notation?

Elena L [17]

Move the decimal so that there is one whole number.

0.00000482 => 4.82

We moved 6 units to the left so:

4.82 * 10^-6

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