Answer:
x = 1, x = -1
Step-by-step explanation:
Given 
Use substitution

Square previous equality:

Substitute it into the equation:

Solve this quadratic equation:

Note that

then

so

Solve this equation using substitution

Thus,
![u+\dfrac{1}{u}=\dfrac{5}{2}\\ \\2u^2+2=5u\ \ [\text{Multiplied by 2u}]\\ \\2u^2-5u+2=0\\ \\D=(-5)^2-4\cdot 2\cdot 2=25-16=9\\ \\\sqrt{D}=3\\ \\u_{1,2}=\dfrac{-(-5)\pm 3}{2\cdot 2}=\dfrac{5\pm 3}{4}=2,\ \dfrac{1}{2}](https://tex.z-dn.net/?f=u%2B%5Cdfrac%7B1%7D%7Bu%7D%3D%5Cdfrac%7B5%7D%7B2%7D%5C%5C%20%5C%5C2u%5E2%2B2%3D5u%5C%20%5C%20%5B%5Ctext%7BMultiplied%20by%202u%7D%5D%5C%5C%20%5C%5C2u%5E2-5u%2B2%3D0%5C%5C%20%5C%5CD%3D%28-5%29%5E2-4%5Ccdot%202%5Ccdot%202%3D25-16%3D9%5C%5C%20%5C%5C%5Csqrt%7BD%7D%3D3%5C%5C%20%5C%5Cu_%7B1%2C2%7D%3D%5Cdfrac%7B-%28-5%29%5Cpm%203%7D%7B2%5Ccdot%202%7D%3D%5Cdfrac%7B5%5Cpm%203%7D%7B4%7D%3D2%2C%5C%20%5Cdfrac%7B1%7D%7B2%7D)
Now,

F is 2 that’s the answer!!
The ordered pair is (-2, -3)
Step-by-step explanation:
- Step 1: To find whether an ordered pair is a solution, substitute values of x and y and see whether it satisfies the equation.
(-3, -2) ⇒ 7 × -3 - 5 × -2 = -21 + 10 = -11 ≠ 1
(-2, -3) ⇒ 7 × -2 - 5 × -3 = -14 + 15 = 1
(0, 4) ⇒ 0 - 5 × 4 = 20 ≠ 1
(4, 0) ⇒ 7 × 4 - 0 = 28 ≠ 1
So the ordered pair is (-2, -3)
Answer:
The original price was $700.
50% of 700 = 350
Answer:
80
Step-by-step explanation: