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Svetach [21]
3 years ago
8

How do you solve this kind of equation? 9(x+2) > 9(x-3)

Mathematics
2 answers:
erastovalidia [21]3 years ago
7 0

Answer:

0>-45

True for all x

Step-by-step explanation:

9(x+2) > 9(x-3)\\\\\mathrm{Expand\:}9\left(x+2\right):\quad 9x+18\\\\\mathrm{Expand\:}9\left(x-3\right):\quad 9x-27\\9x+18>9x-27\\\\\mathrm{Subtract\:}18\mathrm{\:from\:both\:sides}\\\\9x+18-18>9x-27-18\\\\Simplify\\\\9x>9x-45\\0>-45

GalinKa [24]3 years ago
6 0

Step-by-step explanation:

okay so that's an inequality. You solve it the same way you saw the regular equation. the only difference is that if you divide or multiply by a negative number then you have to turn the sign around.

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The sum of two numbers is equal to 11 and the difference is 19. What are the two numbers?
charle [14.2K]

\bold{\huge{\pink{\underline{ Solution }}}}

<u>We </u><u>have </u><u>given </u><u>in </u><u>the </u><u>question </u><u>that</u><u>, </u>

  • <u>The </u><u>sum </u><u>of </u><u>2</u><u> </u><u>numbers </u><u>is </u><u>equal </u><u>to </u><u>1</u><u>1</u><u> </u>
  • <u>The </u><u>difference </u><u>between </u><u>two </u><u>numbers </u><u>is </u><u>1</u><u>9</u><u> </u><u>.</u>

\bold{\underline{ To \: Find }}

  • <u>We </u><u>have </u><u>to </u><u>find </u><u>the </u><u>value </u><u>of </u><u>x </u><u>and </u><u>y</u><u>. </u>

\bold{\underline{ Let's \: Begin }}

Let the two numbers be x and y

<u>According </u><u>to </u><u>the </u><u>question</u><u>, </u>

\sf{ x + y = 11......eq(1) }

\sf{ x - y = 19......eq(2) }

<u>Solving </u><u>eq(</u><u> </u><u>1</u><u> </u><u>)</u><u> </u><u>we </u><u>get </u><u>:</u><u>-</u><u> </u>

\sf{ x + y = 11  }

\sf{ x = 11 - y ......eq(3 ) }

<u>Subsituting </u><u>eq(</u><u>3</u><u> </u><u>)</u><u> </u><u>in </u><u>eq</u><u>(</u><u>2</u><u>)</u><u> </u><u>:</u><u>-</u>

\sf{ x - y = 19 }

\sf{ ( 11 - y) - y = 19 }

\sf{ 11 - y - y = 19 }

\sf{  11 - 2y = 19 }

\sf{ - 2y = 19 - 11  }

\sf{ - 2y = 8}

\sf{ y = 8/(-2) }

\sf{ y = - 4 }

\sf{\red{Thus ,\: the\: value\: of \: y = -4}}

<u>Now</u><u>, </u><u> </u><u>Subsitute </u><u>the </u><u>value </u><u>of </u><u>y </u><u>in </u><u>eq(</u><u> </u><u>3</u><u> </u><u>)</u><u> </u><u>:</u><u>-</u>

\sf{ x = 11 - y  }

\sf{ x = 11 - (-4 )  }

\sf{ x = 11 + 4  }

\sf{ x = 15 }

Hence, The value of x and y are 15 and (-4) .

5 0
2 years ago
​ please hurry and answer 55 + 7a = 19
hichkok12 [17]

Answer:

a = -36/7

Step-by-step explanation:

55 + 7a = 19

(55 - 55) + 7a = (19 - 55)

7a = -36

7a/7 = -36/7

a = -36/7  the fraction can't be simplified any further

3 0
2 years ago
PLEASE PLEASE I NEED HELP ASAP
Sidana [21]
AE = AC = 4

m<CAB = 60 (equilateral triangle)
m<CAE = 90 (square)

m<BAE = 150 (= 60 + 90)

Triangle BAE is isosceles since AB = AE;
therefore, m<AEB = m<ABE.

m<AEB + m<ABE + m<BAE = 180

m<AEB + m< ABE + 150 = 180

m<AEB + m<AEB = 30

m<AEB = 15

In triangle ABE, we know AE = AB = 4;
we also know m<BAE = 150, and m<AEB = 15.

We can use the law of sines to find BE.

BE/(sin 150) = 4/(sin 15)

BE = (4 sin 150)/(sin 15)

BE = 7.727

3 0
3 years ago
Mr. Mutler posts his students' artwork on a bulletin board.
Jlenok [28]
The length could be 5 and width 3. That would equal 15
8 0
2 years ago
Need an answer QUICK pls help
Rom4ik [11]

Answer:

B

Step-by-step explanation:

y = 32

3 0
3 years ago
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