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3 years ago

The product of a number and -4 is 80 please help ;-;

Mathematics

2 answers:

alexira [117]3 years ago

8 0

It’s 4 x 20 = 80 .............

svetoff [14.1K]3 years ago

3 0

Answer:

its -4 x -20 and that equals 80

Step-by-step explanation:

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13x=-21-6y and -8x=36+6y

IgorLugansk [536]

Answer:

$x=3\\y=-10$

Step-by-step explanation:

$13x=-21-6y\\-8x=36+6y$

Let's take one of the equations and solve for x. I'll take the first one.

$13x=-21-6y$

Divide by 13.

$x=\frac{-21-6y}{13}$

Now replace x in the second equation.

$-8x=36+6y\\-8(\frac{-21-6y}{13} )=36+6y$

Distribute -8

$\frac{168+48y}{13}=36+6y$

Break down the fraction.

$\frac{168}{13}+\frac{48}{13}y=36+6y$

Subtract $\frac{168}{13}$

$\frac{48}{13}y=36+6y-\frac{168}{13}$

Subtract 6y

$\frac{48}{13}y-6y=36-\frac{168}{13}$

Combine like terms;

$\frac{48-13*6}{13}y=\frac{36*13-168}{13}$

Solve;

$\frac{48-78}{13}y=\frac{468-168}{13}$

Keep solving;

$\frac{-30}{13}y=\frac{300}{13}$

Multiply by the negative reciprocal of the fraction next to y.

$(-\frac{13}{30} )\frac{-30}{13}y=\frac{300}{13}(-\frac{13}{30} )$

On the right side; 13 and 13 become 1. 300/30 = 30/3 = 10

$y=-10$

After having found y, replace it in any of the equations to find x.

$13x=-21-6y\\13x=-21-6(-10)\\13x=-21+60\\13x=39\\x=\frac{39}{13}\\ x=3$

6 0

3 years ago

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What value of x is in the solution set of 9(2x + 1) < 9x - 18?

Alex17521 [72]

Answer:

b. -3

Step-by-step explanation:

9(2x+1) < 9x-18

(distribute the 9)

18x+9 <9x-18

(subtract 9 from both sides)

18x<9x-27

(subtract 9x from both sides)

9x<-27

(divide both sides by 9)

x<-3

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3 years ago

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Find the sum 14 + (-9) + (-20)

wlad13 [49]

It would be -15 I think just calculate it to make sure xx

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3 years ago

Solve the equation 12 + 4m = 24 A)m=9 B)m=8 C)m=3 D)m=-6

pantera1 [17]

12 +4m = 24

4m = 12

m = 12/4

m = 3 so choice C. is right sure

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3 years ago

Were there more people that were under 20 or 20 and over ? A.under 20 B.20 and over

frutty [35]

The answer would be B

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The product of a number and -4 is 80 *please help ;-;*

The product of a number and -4 is 80 please help ;-;