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meriva
3 years ago
8

How would I solve the equations: y = x-4 and y=x^2-4x using substitution

Mathematics
1 answer:
andriy [413]3 years ago
6 0

Answer:

x = 6

Explanation:

y = x - 4

26 = 4x + y


If y = y, then we can rewrite this system as this: 4x + x - 4 = 26


Then we combine like terms and add 4  on both sides to give us  5  x  =  30 . Divide by 5 on both sides and we arrive at the solution: x = 6

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What is the best estimate of the sum of the fractions?
gavmur [86]

Answer:

499/36

Step-by-step explanation:

If you find the LCM of all fractions and add them then you get 279/36+204/36+16/36 which is equal to 499/36

3 0
3 years ago
If (5-3i)(x+iy)/(4-5i) = (2+i)^2-(3-4i)^2, then x=___ and y=____
Leona [35]
This looks complicated

lets simplify both sides

By multiplying top and bottom by the conjugate:-

left side  =  (5-3i)(x + iy) (4+5i)          (5-3i)(x + iy) (4+5i) 
                  ------------------------   =      ------------------------
                        (4-5i)(4+5i)                           41

right side =  (2 + i + 3-4)(2+i - 3 + 4i)    (by  Difference of 2 squares)

               =  5-3i)(-1 + 4i)

so as left side = right side

(5-3i)(x+yi)(4+5i)   = 41 (5-3i)(-1+5i)

5-3i is common so:-

(x + iy)(4+5i) = 41(-1+5i)

4x +5xi + 4yi - 5y = -41 + 205i

4x - 5y + (5x + 4y)i = -41 + 205i

EQuating coefficients we are left with the system of equations

4x -  5y = -41
5x + 4y  = 205

solving this gives x = 21 and y = 25


8 0
3 years ago
Chad is driving 56 miles per hour. Chad drove 168 miles in 3 hours.Chad will drive 672 more miles. He continues to drive at the
shusha [124]
So, 672 miles divided by 56 miles per hour = 12 hours
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3 years ago
Estimate the sum of 1/8 + 1/4
Alex17521 [72]
1/8+1/4=1/8+2/8=3/8
About 0.4 because 4•8=32~30
7 0
3 years ago
Read 2 more answers
Someone plz help jkbb;jkbh n
chubhunter [2.5K]

Answer:

A

Step-by-step explanation:

Percent go on 1 side

125

----       125% out of 100%

100

35 next to 125% due to the unknown amount of votes on the other side

P goes under 3 and the answer is A

3 0
3 years ago
Read 2 more answers
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