3 years ago

How would you solve 3x-4=9x-21

Mathematics

2 answers:

Mnenie [13.5K]3 years ago

8 0

3x - 9x = -21 + 4
-6x = -17
x = -17/-6
x = 17/6

Kobotan [32]3 years ago

7 0

3x - 4 = 9x - 21

Subtract 9x from both sides.

3x - 9x - 4 = -21

Add 4 to both sides.

3x - 9x = -21 + 4

Simplify.

-6x = -17

Divide both sides by -6.

x = 17/6 AND 2 5/6

~Hope I helped!~

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Black_prince [1.1K]

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answer is 5x+3

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Answer:

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Step-by-step explanation:

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vivado [14]

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Use linear combination to solve this problem. show your work.<br><br> 3x + 2y = -4<br> 4x - y = 13

pshichka [43]

Answer:

The solution of the system of equations is the point $(2,-5)$

Step-by-step explanation:

we have

$3x+2y=-4$ -----> equation A

$4x-y=13$ -----> equation B

Multiply the equation B by 2 both sides

$2*(4x-y)=2*13$

$8x-2y=26$ ------> equation C

Adds equation A and equation C

$3x+2y=-4\\8x-2y=26\\----------\\3x+8x=-4+26\\11x=22\\x=2$

Find the value of y

Substitute the value of x in equation A

$3(2)+2y=-4$

$2y=-4-6$

$y=-10/2=-5$

The solution of the system of equations is the point $(2,-5)$

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