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4 years ago

Evaluate the function: y= -2x + 11 when x = 5.y=_____

Mathematics

1 answer:

gregori [183]4 years ago

6 0

Answer:

y=1 when x=5

Step-by-step explanation:

-2(5)+11=-10+11=1

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Answer: Choice B

$\left\{ \ 3, 5, \sqrt{34} \ \right\}$

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

Explanation:

We'll be using the converse of the pythagorean theorem.

If we had a triangle with sides a,b,c and $a^2+b^2 = c^2$ was true, then we have a right triangle. Note: c is always the longest side

For the first answer choice we have: a = 5, b = 8, c = 12

Then,

$a^2+b^2 = c^2\\\\5^2+8^2 = 12^2\\\\25+64 = 144\\\\89 = 144\\\\$

which is false. This shows that we do not have a right triangle with sides 5,8,12. This rules out choice A. Choice C is a similar story.

Choice B on the other hand works because

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We have a true statement at the end, which confirms <u>choice B</u> is a right triangle.

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2 years ago

Can somebody help me with this question

Alexus [3.1K]

We start with:

y=2x-15
y=5x

Now, we have a perfectly set-up variable we can get rid of: <em>y.</em>

But we need to make either the top or bottom equation negative, so for simplicity, let's make the bottom one negative.

y=2x-15
(-y)=(-5x)

Now simplify.

-3x-15=0

Add 3x on both sides.

3x=15

Divide by 3 on both sides.

x=5

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3 years ago

Evaluate the function: y= -2x + 11 when x = 5.y=_____​

Evaluate the function: y= -2x + 11 when x = 5.y=_____