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Maru [420]
3 years ago
14

X + y = –4 y = 3x + 16

Mathematics
2 answers:
kotykmax [81]3 years ago
8 0
-4-x=3x+16
-4=4x+16
4x=-20
x=-5
babymother [125]3 years ago
6 0
If
x+y=-4
y-3x=16 or we cn write as
   x+y=-4
-3x+y=16
i multiply the first equation by 3
3x+3y=-12
-3x+ y=16
4y=4
y=1
x+1=-4
x=-5

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If f(x)=3x+2,find f(f^-1(14)).
lisov135 [29]

Answer:  14

<u>Step-by-step explanation:</u>

f(x) = 3x + 2

To find f⁻¹, swap the x's and y's and solve for y --> Note: f(x) is y

x = 3y + 2

x - 2 = 3y

\dfrac{x-2}{3}=y

\implies f^{-1}(x)=\dfrac{x-2}{3}

\implies f^{-1}(14)=\dfrac{14-2}{3}

\implies f^{-1}(14)=\dfrac{12}{3}

\implies f^{-1}(14)=4

f(f⁻¹(14)) = f(4)

              f(4) = 3(4) + 2

                     = 12 + 2

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NOTE: the simplified version is .... f and f⁻¹ cancel out, leaving you with 14

4 0
3 years ago
Aaron bought 7/8 of a yard of fabric and it cost him $4.10. What does a full yard cost?
gayaneshka [121]
Divide 4.10 by 7 to get about 0.59 (round up because you can't get part of a penny) and that gives you 1/8 of a yard's price. Then multiply that by 8 to get a full yard for $4.72.

7 0
3 years ago
7k + 5 – 2 = 7k + 3 0<br><br> Anyone sorry for so many i just need help
mamaluj [8]

Answer:

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Step-by-step explanation:

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6 0
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A pair of numbers that has the sum of 12 and a difference of eight
anygoal [31]

Answer:

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a = 12 - B

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7 0
3 years ago
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MArishka [77]

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Step-by-step explanation:

To find the zeros, just move the constants to the other side,

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Hope it helps!

8 0
2 years ago
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