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4 years ago

Solve for x & y: x^2+y^2=20. 3x+y=2

2 answers:

6 0

You're solving a system here, easy peasy. Solve the second equation for y to get y = 2 - 3x. Now in the first equation, sub in this y value where you see a y and now the equation is in terms of x only: x^2 + (2-3x)^2 = 20. You have to FOIL out the (2-3x)^2 first to get x^2 + 4 - 12x + 9x^2 = 20. Now combine like terms to get 10x^2 - 12x + 4 = 20. Move the 20 over by subtraction to get
10x^2 - 12x - 16 = 0. Factor this now, taking a 2 out first: 2(5x^2 - 6x -8)=0 and you get factors of 2(x-2)(5x+4)=0. x=2 or x = -4/5. If x = 2, then y = -4. If x = -4/5, then y = 22/5

Lerok [7]4 years ago

5 0

Answer:

Step-by-step explanation:

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What percent of 40 is 20?

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2 years ago

Read 2 more answers

Which equation supports the given conjecture? The difference of two odd numbers is an even number. A. 23 – 19 = 4 B. 16 – 10 = 6

MissTica

Answer: <span>A. 23 – 19 = 4

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3 years ago

Twice a number added to a smaller number is 5. The difference of 5 times the smaller number and the larger number is 3. Let x re

Veronika [31]

Answer:

The equations which represents the situation are

1) 2Y+X=5

2) 5X-Y=3

Step-by-step explanation:

<em>~Cornasha_Weeb</em>

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3 years ago

Abby's school is 6 blocks west of her house. Her mother works at a store that is 4 blocks east of her school. Use a number line

faltersainse [42]

Answer:

Step-by-step explanation:

Let us give a proper illustration in the number line

let H be Abby's house

and S be the school

let W be her mother's work.

kindly find attached a rough sketch of the number line for your reference

Question:<em> What value represents the difference in position between Abby's house and her mother's store?</em>

basically, the distance between two points on a number line is the difference between the points.

So the value that represents the position between Abby's house and her mother's store is the distance between the two points.

= 4-(-6)

=4+6

=10

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3 years ago