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3 years ago

Solve the system by the substitution method. Show your work. 2y - x = 5 x^2 + y^2 - 25 = 0

1 answer:

6 0

2y - x = 5
x^2 + y^2 - 25 = 0

x = 2y - 5

(2y-5)^2 + y^2 - 25 = 0
(2y-5)(2y-5) + y^2 - 25 = 0
4y^2 - 20y + 25 + y^2 - 25 = 0
5y^2 - 20y = 0
y = 0 , y = 4

x = 2y - 5 , when y = 0
x = - 5

x = 2y - 5 , when y = 4
x = 8 - 5
x = 3

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3 years ago

Read 2 more answers

natka813 [3]

Answer:

x= -8 , y = 5

x= 25/4 , y = 1/4

Step-by-step explanation:

substitute first eqn into the second eqn:

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4y^2 - 21y + 5 = 0

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4 years ago

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A book club offers a choice of 8 books from a list of 40. In how many can a member make a collection?

egoroff_w [7]

You have to divide 40 by 8
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4 years ago

What is the multiplicative inverse of 19/3

denpristay [2]

Answer:

3/19

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3 0

3 years ago

Really need help with my aleks

tatiyna

Answer:

(4x -4)° +x° +(6x-3)° = 180°
J = 99°
K = 64°
L = 17°

Step-by-step explanation:

The relation that helps you write an equation for x is, "the sum of angles in a triangle is 180°."

<h3>equation</h3>

(4x -4)° +x° +(6x -3)° = 180° . . . . . sum of angles in this triangle

<h3>solution for x</h3>

11x -7 = 180 . . . . . . . divide by °, collect terms

11x = 187 . . . . . . . . add 7

x = 17 . . . . . . . . . divide by 11

<h3>angle values</h3>

m∠J = (6x -3)° = (6(17) -3)° = 99°

m∠K = (4x -4)° = (4(17) -4)° = 64°

m∠L = x° = 17°

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2 years ago