3 years ago

-8x+8y=8 and -8x-8y=40

Mathematics

2 answers:

ra1l [238]3 years ago

8 0

Let’s use the elimination method

-8x + 8y = 8
-8x -8y = 40
———————-
-16x = 48
x = -3

quester [9]3 years ago

6 0

x = -3 (....................................)

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Anna71 [15]

Since 6 is positive, it's (x+blank)^2

6/2=3, and (x+3)^2 = x^2+6x+9. We have x^2+6x-2, so we have to add 9 to both sides to get (x+3)^2-2=9, then subtract 9 from both sides to get
(x+3)^2-11=0, or (x+3)^2=11. Square root both sides to get x+3=sqrt(11), and x=sqrt(11)-3, which is approximately 0.32

8 0

3 years ago

For the function f(x)=3/4x-5 what is f(16)?

GuDViN [60]

$\displaystyle{ f(x)= \frac{3}{4x} -5 } \\\\ f(16)=? \\\\ --------- \\ \\f(16)= \frac{3}{4 \cdot16} -5 = \\ \\ \frac{3}{64} -5^{(64} = \\ \\ \frac{3}{64} - \frac{320}{64}= -\frac{317}{64} =-4.95$