<span>x+4y=21
4x-y=16
Isolate one of the variables
x + 4y = 21
subtract 4y from both sides
x = -4y + 21
Plug that into the other equation
4x - y = 16
4(-4y + 21) - y = 16
-16y + 84 - y = 16
combine like terms
-17y + 84 = 16
subtract 84 from both sides
-17y = -68
divide both sides by -17
y = 4
Plug that into the equation
</span><span>x+4y=21
x + 4(4) = 21
x + 16 = 21
subtract 16 from both sides
x = 5
Hope this helps!</span>
Answer:
0.7173 miles per hour
Step-by-step explanation:
divide 1.265 by 2.3
Answer:
A)
Step-by-step explanation:
from 0 to 5, x was moved right 5 units on the first is + 5
then, -1 to -5. it went down 4 units so -4
The answere is 1/4x-10=-50
Answer:
<u>4</u>
Step-by-step explanation:
Given :
<u>f(x) = x² - 6x + 8</u>
<u />
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Solving :
<u>Splitting the middle term</u> :
⇒ f(x) = x² - 6x + 8
⇒ f(x) = x² - 2x - 4x + 8
⇒ f(x) = x (x - 2) - 4 (x - 2)
⇒ f(x) = (x - 4)(x - 2)
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Solutions :
⇒ x - 4 = 0 ⇒ x = <u>4</u>
⇒ x - 2 = 0 ⇒ x = 2