3 years ago

Please help with POWER FUNCTIONS!!!!!

1 answer:

7 0

First answer, both functions are parabolas (bowl shaped) that curve upward. The 3 makes (1/3)f(x) = g(x) the graph narrower.

36 = a(3)^2
36 = 9a
36/9 = a
4 = a

f(x) = 4x^2

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3 years ago

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To eliminate the y-terms and solve for x in the fewest steps, by which constants should the equations be multiplied by before ad

vovikov84 [41]

Answer:

use -9 to multiply the first equation

use -4 to multiply the second equation.

Step-by-step explanation:

5x-4y=28.....eqn (1)×-9

3x-9y=30....eqn(2)×-4

-45x+36y=-252

-(-12x+36y=-120)

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substitute (x=4) in any of the equation. I'm just going to use eqn 1.

5x-4y=28

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20-4y=28

-4y =28-20

-4y÷-4 = 8÷-4

y=-2

so, x=4, y=-2

Note: for proof of answers substitute the answers for x and y and see if you have the same result...e.g

5(4)-4(-2)=28.

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3 years ago

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