Can someone check my answers? I'm not sure I have them all right...

1 answer:

3 0

What is the y-intercept of the plane whose equation is 4x + 5y + z = 20?

(0, 4, 0)

Which equation has intercepts at X(1, 0, 0), Y(0, 1, 0), and Z(0, 0, 2)?

2x + 2y + z = 2

Which equation is equivalent to x + 3y + z = 3?

4x + 12y + 4z = 12

Which of the following points lies in the plane 3x + 2y + 4z = 12?

(4, 3,2)

Hope these answer the questions. Have a nice day.

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Please, help me I’m so dumb

Igoryamba

Answer:

Step-by-step explanation:

You know that 9 = 10 - 1.

Then 9 of something is equal to 10 of it less one of it. Here, that "something" is four.

$\begin{array}{cl}9\times4&=10\text{ fours}-\boxed{1}\text{ four}\\&=\boxed{40}-4\\&=\boxed{36}\end{array}$

_____

Comment on this math

This illustrates a shortcut for multiplying by 9 that can be convenient for mental arithmetic. The idea is to multiply by 10, which just involves adding 0 (or moving the decimal point), then subtract the original number.

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Step-by-step explanation:

In the attached file