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2 years ago

How are you supposed to do this

Mathematics

2 answers:

OlgaM077 [116]2 years ago

4 0

Answer:

4x < -8

you will need to isolate the variable to be by itself by performing the inverse property of multiplication which is division;

/4 /4(divide by 4 from both sides)

x < -2

Pavlova-9 [17]2 years ago

3 0

Answer:

4x < -8

you will need to isolate the variable to be by itself by performing the inverse property of multiplication which is division;

/4 /4(divide by 4 from both sides)

x < -2

Step-by-step explanation:

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3 years ago

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3 years ago

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Solve the system of linear equations using elimination.

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Step-by-step explanation:

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3 years ago

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NemiM [27]

Answer: Choice C

(4, 18)

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

Explanation:

One point shown on the graph is (2,9)

If we double each x and y coordinate, then

2*2 = 4
9*2 = 18

We go from (2,9) to (4,18)

Plotting this point on the graph will be on the same line as the other points.

Or you could note that y/x = 9/2 = 18/4 = 4.5

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2 years ago

Solve using addition method 3x-3y+2z=7 3x+y-3z=-5 7x-y-2z=0

frozen [14]

3x - 3y + 2z = 7
3x + 1y - 3z = -5 ⇒ 6x - 2y - 1z = 2 ⇒ 42x - 14y - 7z = 14
7x - 1y - 2z = 0 ⇒ 7x - 1y - 2z = 0 ⇒ 42x - 6y - 12z = 0 
 -20y - 19z = 14
 -20y + 20y - 19z = 14 + 20y
 -19z = 14 + 20y
 -19 -19
 z = -14/19 - 1 1/19y
 3x - 3y + 2(-14/19 - 1 1/19y) = 7
 3x - 3y - 1 9/19 - 2 2/19y = 7
 3x - 5 2/19y - 1 9/19 = 7
 +1 9/19 +1 9/19 
 3x - 5 2/19y = 8 9/19
 3x - 3x - 5 2/19y = 8 9/19 - 3x
 -5 2/19y = 8 9/19 - 3x
 -5 2/19 -5 2/19
 y = -1 64/97 + 57/97x
 3x - 3(-1 64/97 + 57/97x) + 2(-14/19 - 1 1/19y) = 7
 3x + 4 95/97 + 1 74/97x - 1 9/19 - 2 2/19y = 7
 4 74/97x - 2 2/19y + 3.5056972328 = 7
 -3.5056972328 -3.5056972328
 4 74/97x - 2 2/19y = 3.494302767
 4 74/97x + 2 2/19y - 2 2/19y = 3.494302767 + 22/19y
 4 74/97x = 3.494302767 + 2 2/19
 4 74/97 4 74/97
 x = 0.7336523126 + 0.4420141262y
3(0.733652316 + 0.4420141262y) - 3(-1 64/97 + 57/97x) + 2(-14/19 - 1 1/19y)=7
 2.200956948 + 1.326042379y + 4 95/97 - 1 74/97x - 1 9/19 - 2 2/19y = 7 -1 74/97x - 0.7792207789y + 5.706654181 = 7
 -5.706654181 -5.70665418
 -1 74/97x - 0.7792207789y = 1.293345820
(x, y, z) = (0.733652316 + 0.4420141262, -1 64/97 + 57/97x, -14/19 - 1 1/19y)

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3 years ago