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2 years ago

What dose "{" mean in algebra? Ex. {4y-2x-8 {5x-4y=20

Mathematics

1 answer:

GaryK [48]2 years ago

4 0

Answer:

System of Equations

Step-by-step explanation:

A system of equations refers to a number of equations with an equal number of variables. We will only look at the case of two linear equations in two unknowns. The bracket on the left indicates that the two equations are intended to be solved simultaneously, but it is not always used.

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The value of y varies directly with x. If x =3, then y=21. What is the value of x when y=105?

Goshia [24]

Answer:

x = 15

Step-by-step explanation:

given that y varies directly with x

mathematically we can express this as

y = k x , where k is a constant

step 1: find k

given x = 3 and y = 21

y = k x

21 = k (3)

k = 7

hence the equation becomes

y = 7 x

when y = 105,

105 = 7x

x = 105 / 7 = 15

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3 years ago

The pentagonal prism has a perpendicular distance of 14 units between the bases. The volume of the prism is 840 cubic units. Wha

Leno4ka [110]

Answer:

Option 4. Perimeter = 30 units

Step-by-step explanation:

Since the volume of a pentagonal prism is 840 cubic units.

Perpendicular distance between the bases = 14 units

We know volume of a pentagonal prism = Area of base × distance between the bases

840 = Area × 14

Area = 840/14 = 60 square units

Now area of a pentagon

$A=\frac{a^{2}}{4}\times\sqrt{5(5+2\sqrt{5})}$

$1.72a^{2}=60$

$a^{2}=\frac{60}{1.72}=34.90$

$a=\sqrt{34.9}=5.91$

Therefore perimeter of the pentagon = 5×a = 5×5.91 = 29.54 ≈ 30 units

8 0

3 years ago

Giving brainily whoever gets it right.

worty [1.4K]

Answer:

136 i believe

Step-by-step explanation:

6 0

2 years ago

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In 3 months John collected a debt of $70.00. What was the average amount of debt John collected per month?

Shalnov [3]

Answer:

$23

Step-by-step

Johns debt is 70.00 dollars in 3 months. 70 divided by 3 is 23.

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2 years ago

Write the equation of the line that contains the given point and the given slope. (-46,45), slope=2.5 please help and explain

Elis [28]

Answer:

y = 2.5x + 160

Step-by-step explanation:

b = 45 - (2.5)*(-46)

b = 45 + 160

b = 205

3 0

2 years ago

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