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3 years ago

X +y=5, 3x-2y+5=0, this is the question

Mathematics

1 answer:

Neko [114]3 years ago

4 0

Step-by-step explanation:

x+y=5

3x-2y+5=0

3x-2y= -5

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

3x-2y= -5....... equation 2

there fore make x the subject of the formula in equation 1

x=5-y.. equation 3

substitute equation three in equation 2

3(5-y)-2y=-5

15y-3y-2y=-5

10y=-5

divide both sides by 10

y=-5/10

y=-½

substitute y into equation 1

x+(-½)=5

x=5+½

x=5½

x=5½,y= -½

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In a class, there are 20 girls and 10 boys. What is the percentage of the boys?

gayaneshka [121]

Answer:

33.33%

Step-by-step explanation:

Number of boys=10
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Percentage of boys=

10/30×100%

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4 0

3 years ago

Please help and thank you

ycow [4]

Answer:

D) 130 workers

Step-by-step explanation:

We have the equation, y = 2x + 40, and y, 300 (since the y-coordinate represents the # of bottles made), so we can solve for x, the number of workers needed.

Substitute: 300 = 2x + 40

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Divide: x = 130

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3 years ago

Determine which of the following situations requires the distributive property in order to simplify the expression. Select all s

ipn [44]

Answers

9(x + y)

(7 - a)(b)

The Distributive Property is used in algebraic expressions to multiply a single term and two or more terms which are inside a set of parentheses.

In the case of x(2y), there is only one term inside the parenthesis

In the case of 9(x ∙ y), the distributive property is not used because (x ∙ y) = xy which means only one term will be multiplied by the term outside the parenthesis (9)

In the case of 9(x + y), the distributive property is used because the two terms in the parenthesis (x and y) will be multiplied by the term outside the parenthesis (9)

9(x + y) = 9*x + 9*y (by applying the distributive property)

In the case of (7 ∙ a)(b), the distributive property is not used because (7 ∙ a) = 7a which means only one term will be multiplied by the term outside the parenthesis (b)

In the case of (7 - a)(b), the distributive property is used because the two terms in the parenthesis (7 and -a) will be multiplied by the term outside the parenthesis (b)

(7 - a)(b) = 7*b - a*b (by applying the distributive property)

In the case of (2 ∙ x) ∙ y, the distributive property is not used because (2 ∙ x) = 2x which means only one term will be multiplied by the term outside the parenthesis (y)

8 0

3 years ago

Read 2 more answers

I need help please Will mark brainliest

natima [27]

Answer:

which ones do you need answered

Step-by-step explanation:

7 0

2 years ago

determine the simple interest applied to a principle over 20 years if the total interest paid equals the borrowed principal

Over [174]

Answer:

Step-by-step explanation:

You want to find r when ...

I = Prt

is equal to P and t=20.

P = Pr·20 . . . . fill in the problem values

1/20 = r = 0.05 = 5% . . . . divide by 20P

The simple interest rate is 5%.

6 0

3 years ago

X +y=5, 3x-2y+5=0, this is the question​

X +y=5, 3x-2y+5=0, this is the question