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erik [133]
2 years ago
9

Is substitutions the best method to use when one variable is already known

Mathematics
2 answers:
8_murik_8 [283]2 years ago
8 0
There’s two ways to substitute, but i think you mean if you know x but don’t know y. if that is true, then yes use substitution
Mama L [17]2 years ago
7 0
Substitution Method is used for solving equations in 2 Variables, where you find the value of one variable in terms of the other and then substitute that value into any one of the equations. It can also be used when one Variable is known to you and you have to find the other.
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PLEASE HELP ME.<br><br> Is the point (3,-2) on the graph of 3x – 2y = 12?
Zinaida [17]

Answer:

use photo math, take a picture of the equation, go down to the graph and see if there is a plot on (3,-2)

3 0
3 years ago
When the square of a certain number is diminished by 9 times the number the result is 36?
ArbitrLikvidat [17]
X²-9x=36
minus 36 both sides
x²-9x-36=0
what 2 numbers multiply to -36 and add to -9
-12 and 3
(x-12)(x+3)=0
set to zero
x-12=0
x=12

x+3=0
x=-3



the number is either -3 or 12
3 0
3 years ago
BRAINLY FOR THE FASTEST WITH GOOD EXPLANATIONS
Neporo4naja [7]

So, when we're tasked with things like this, rewriting everything in terms of sine and cosine and combining fractions often trivializes things, so doing just that gives us:

\frac{\frac{1}{\cos{x}}-\frac{1}{\sin{x}}}{\frac{\cos{x}}{\sin{x}}-1}= \\\frac{\frac{=(\cos{x}-\sin{x})}{\cos{x}\sin{x}}}{\frac{\cos{x}}{\sin{x}}-\frac{\sin{x}}{\sin{x}}}=\\\frac{-(\cos{x}-\sin{x})}{\cos{x}\sin{x}}*\frac{\sin{x}}{\cos{x}-\sin{x}}=\\-\frac{1}{\cos{x}}

So out expression is 1/cos(x).

4 0
3 years ago
HELP ASAP. BRAINLIST IF YOU ANSWERED IT RIGHT
S_A_V [24]

Answer:

The answer is D.

Step-by-step explanation:

In similarity, the triangles have the same angles but different length of sides.

(Correct me if I am wrong)

3 0
3 years ago
Read 2 more answers
No one is answering i posted this question 2 times, this is my 3rd time please answer.
Dahasolnce [82]

Answer:

13

Step-by-step explanation:

First, fill in 3 boxes of the table using the given information (blue numbers on the attached table)

"Of the 32 students that have a cell phone, 19 students do not have a tablet."

The top row of the table is students who have a cell phone.  Therefore, place 19 in the box in this row that is in the "no tablet" column.

"Of the 70 students that have a tablet, 57 students do not have a cell phone."

The first column of the table is students who have a tablet.  Therefore, place 57 in the box in the 2nd row of this column.

"11 students do not have a cell phone or a tablet."

Find the "no cell phone" row and the "no tablet" column and place 11 in the box that coincides.

We can calculate the blank totals using addition (shown by green numbers on the attached table)

  • Total students with no cell phone = 57 + 11 = 68
  • Total students with no tablet = 19 + 11 = 30

To calculate the number of students who have a cell phone AND a tablet:

⇒ Total students with a cell phone <em>minus</em> students with a cell phone but no tablet

⇒ 32 - 19 = 13

4 0
2 years ago
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