3 years ago

Help with practice problem

1 answer:

6 0

Answer

x^2 - y^2 x4

0.25 9

You might be interested in

baherus [9]

Answer:

Step-by-step explanation:

$\sqrt{15}\\=3.87298\dots \\\\= 4$

4 0

3 years ago

Sholpan [36]

With some simplification,

cos⁻¹(x) - 5 cos⁻¹(x) - π/3 = 2π/3

becomes

-4 cos⁻¹(x) = π

cos⁻¹(x) = -π/4

However, the inverse cosine function has a range of 0 ≤ cos⁻¹(x) ≤ π, so there are no solutions to this equation.

4 0

3 years ago

kipiarov [429]

6/9=x/21
x=21*6/9
=126/9
x=14

6 0

3 years ago

Alex_Xolod [135]

The correct answer is the first option.

If you want to use elimination, you can sum the two equations for example, so that the x's simplify:

$(-2x+4y)+(2x+2y) = 16+8$

$6y = 24$

$y = 4$

Plug this value for y in one of the equations to derive the value of x:

$2x+2y=8 \implies 2x + 8 = 8 \implies x = 0$

So, the solution is $(x,y) = (0,4)$

8 0

3 years ago

o-na [289]

I may help you, do you have discord? it would be better if we move it there, my user is ri#0511

5 0

3 years ago