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nevsk [136]
3 years ago
15

Solve the simultaneous equations -x + 4y = 12 x + y = - 7

Mathematics
1 answer:
blondinia [14]3 years ago
7 0

Answer:

y = 1, x = - 8

or

(-8, 1)

Step-by-step explanation:

-x + 4y = 12

x + y = -7

add the equations together

0x + 5y = 5

5y = 5

y = 1

substitute y for 1 in one of the original equations to find x

x + y = -7

x + 1 = -7

x + 1 - 1 = - 7 - 1

x = - 7 - 1

x = -8

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There are over 2700 species of snakes in the world over 600 are venomous Express the fraction of species that are not venomous a
Andre45 [30]
You do 600 divided by 2700 and you end up with 22/100 or 0.22 as a decimal. So if 0.22 or 22/100 are venimous then 78/100 or 0.78 are non venimous. I understand its a bit confusing and i can simplify it for you but still I hope this helps :)
6 0
3 years ago
Can someone please help I can't solve this problem!!!!!!!!!!!
notsponge [240]

Answer:

8 dolls

Step-by-step explanation:

METHOD 1:

Step 1: Convert 25% into decimal (0.25)

Step 2: Multiply by 32 (32 × 0.25 = 8)

METHOD 2:

25% of a number will be one-fourth of that number. Divide 32 by 4 to get 8 (or multiply 32 by 1/4).

6 0
3 years ago
A sphere rolls up an inclined plane of inclination angle 30 degree. At the bottom of the incline the center of mass of the spher
Zigmanuir [339]

Answer: The sphere is 0.002548 cm travel up the plane.

Step-by-step explanation:

Since we have given that

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As we know that

KE=0.5\times lw^2=PE

and

Length of solid sphere is given by

l=\dfrac{2Mr^2}{5}

So, it becomes,

KE=0.5\times \dfrac{2Mr^2}{5}w^2=Mgd\sin \theta

And 0.25\ m/sv=rw

So, it becomes,

1\times (0.25)^2=5\times d\times 9.81\times \sin 30^\circ\\\\0.0625=49.05d\times \dfrac{1}{2}\\\\\dfrac{0.125}{49.05}=d\\\\d=0.002548

Hence, the sphere is 0.002548 cm travel up the plane.

5 0
4 years ago
Sonya's employer matches 25% of Sonya's contributions to her 401(k) plan. If Sonya's employer contributed $600 to the plan last
maksim [4K]
 So, if 600 is 25%, that means we do 600*4=2400 600 is 1/4 of 2400. 

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I hope this helps!
8 0
3 years ago
Read 2 more answers
Could someone please help
ololo11 [35]
Ok so when you add fractions, the denominators have to be the same, therefore: (whole numbers you can still add)

5(1/2)+5(1/2)= 10(2/2), which equals to 11.

5(1/2) is also 5.5, since 1/2 is 50/100.

5.5 + 5.5 = 11


8 0
4 years ago
Read 2 more answers
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