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4 years ago

How to solve 3x+2y=-1, 6x+4y=0 by elimination

1 answer:

3 0

(1) 3x+2y=-1
(2) 6x+4y=0

This system of equation has no solution. Proof
multiply all the term of (1) by two ==>6x+4y=-2
Notice that in (2) you have the same thing but equal to zero.
Same quantity can't equal 0 & -2. So no solution

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Which of the following are solutions to 2x2 – 8x - 90? Select all that apply.

Bond [772]

Answer:

x=-5, x=9

Step-by-step explanation:

we know that

The formula to solve a quadratic equation of the form

$ax^{2} +bx+c=0$

is equal to

$x=\frac{-b\pm\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$2x^{2} -8x-90$

equate to zero

$2x^{2} -8x-90=0$

$2=-1\\b=-8\\c=-90$

substitute in the formula

$x=\frac{-(-8)\pm\sqrt{-8^{2}-4(2)(-90)}} {2(2)}$

$x=\frac{8\pm\sqrt{784}} {4}$

$x=\frac{8\pm28} {4}$

$x=\frac{8+28} {4}=9$

$x=\frac{8-28} {4}=-5$

therefore

The solutions are x=-5, x=9

6 0

3 years ago

I would like the answer to 1/4 minus 1/3 is it 12

Mrac [35]

Answer:

-1/12

Step-by-step explanation:

1/4 - 1/3 = 3/12 - 4/12 = - 1/12

4 0

2 years ago

Convierte la siguiente fracción a decimal(4 decimales): 24/33

kkurt [141]

Answer:

Step-by-step explanation:

3 0

3 years ago

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The scale of a map says that 4 çm represents 5 km.

labwork [276]

Answer:

3.2 km

Step-by-step explanation:

4cm÷5km=0.8 per cm to km

4km×0.8 km=3.2 km represents

6 0

2 years ago

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-5√112 <br> I have to solve this using perfect square factors, is anyone familiar with those?

svp [43]

Answer:

-20√7

Step-by-step explanation:

Here. we want to write this in the simpler form

we can have 112 as; 16 * 7

√112 = √(16*7)

√112 = 4 √7

so, we have

-5 * 4 √(7 = -20 √7

5 0

3 years ago