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Tom [10]
2 years ago
9

Use substitution to solve each system of equations. y = 5x -2 3 x- 5y =4

Mathematics
2 answers:
Nezavi [6.7K]2 years ago
7 0
  • x = 3/11
  • y = -7/11

Step-by-step explanation:

y = 5x - 2…Equation 1

3x - 5y = 4…Equation 2

Subtitute value of y to Equation 2 :

3x - 5(5x - 2) = 4

3x - 25x + 10 = 4

-22x + 10 = 4

10 - 4 = 22x

6 = 22x

6/22 = x

<u>3/11 = </u><u>x</u>

Subtitute value of x to one of Equation :

for example Equation 2…

3x - 5y = 4

3(3/11) - 5y = 4

9/11 - 5y = 4

9/11 - 4 = 5y

(9 - 44)/11 = 5y

(-35)/11 = 5y

(-35)/11 × 1/5 = y

<u>-7/11 = y</u>

Mrrafil [7]2 years ago
3 0
3x - 5(5x - 2) = 4

3x - 25x + 10 = 4
-22x = 4 - 10
-22x = -6 ➗ -22
X = 3/11
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A certain forest covers an area of 2400 km^2. Suppose that each year this area decreases by 5.75%. What will the area be after 8
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We have to use the function A(t)= a(1 +/- r)^t
So A is going to be the answer- the area after 8 years. t is going to be 8, because t is time. a is 2400 because that's the starting value. Finally, we're going to turn 5.75% into it's decimal form of .0575. That's going to be r, and because the area is decreasing, we will subtract r from 1.
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Help pls 25 points i don’t understand
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Calm Down this is a nasty proof

CB is parallel to ED (Given)

CB is congruent to ED (Given)

Angle CBF is congruent to Angle EDF (Vertical Angles)

Angle DEF is congruent to Angle BCF (Alternate Interior Angles)

Angle EDF is congruent to Angle CBF (Alternate Interior Angles)

Therefore we now have enough information to solve.  We have a side angle side triangle here so.....

Triangle CBF is congruent to Triangle EDF because of the Side Angle Side Theorem.

Good Luck and Your Welcome


8 0
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