2 years ago

Solve: x+y=5 x-4y=20

Mathematics

1 answer:

WARRIOR [948]2 years ago

6 0

Answer:

x=8

y=-3

Step-by-step explanation:

let

x+y=5........ equation 1

x-4y=20....... equation 2

x=20+4y

substituting the value of x in eq 1

x+y=5

20+4y+y=5

5y=5-20

y=-15/5

y=-3

again putting the value of y in eq 2

x=20+4y

x=20+4(-3)

x=20-12

x=8

You might be interested in

How many hours? Thank you for your time.

Lady_Fox [76]

Answer:

3/4 hours I believe so??

3 0

3 years ago

Somebody please help me. This makes zero sense.

earnstyle [38]

Answer:

Step-by-step explanation:

rearrange it like an equation.

take everything else out of the middle apart from x.

make sure that what you do to the middle you do to both sides

6 0

3 years ago

The volume of a sphere is 904.32 mm^3. What is the approximate volume of a cone that has the same height and circular base with

kramer

Answer:

$V_c=452.16\ mm^3$

Step-by-step explanation:

Given that,

The volume of a sphere is 904.32 mm³.

The volume of a cone that has the same height and circular base with the same diameter is:

$V_c=\dfrac{1}{3}\pi r^2 \times 2r=\dfrac{2}{3}\pi r^3$

The volume of a sphere with the same radius is:

$V_s=\dfrac{4}{3}\pi r^3=2\times \dfrac{2}{3}\pi r^3$

So, the volume of sphere is :

$V_c=\dfrac{V_s}{2}\\\\V_c=\dfrac{904.32 }{2}\\\\V_c=452.16\ mm^3$

So, the volume of the cone is $452.16\ mm^3$ .

4 0

3 years ago

Do the pairs (-5,-3),(-1,5),(-7,-7),(0,7)repeat linear functions ? and how ?

Westkost [7]

Im not sure about this one but i think the answer is yes because none of the numbers repeat

4 0

3 years ago

Simplify the expression (3-4i)(1+5i)-(2-i). Please show your work

velikii [3]

Answer:

21 + 12i

Step-by-step explanation:

Given

(3 - 4i)(1 + 5i) - (2 - i) ← expand the product of factors using FOIL

= 3 + 11i - 20i² - 2 + i ( note i² = - 1 )

= 3 + 11i + 20 - 2 + i ← collect like terms

= 21 + 12i

8 0

4 years ago

Read 2 more answers