Solve the system of linear equations using matrices.

-x = 2 + 5y + 5z
-5y + 4z = 19 - 4x
x + 5y - z = -20

Rewrite each equation in form ax+by+cz=d

x +
y +
z=

x +
y +
z=

x +
y +
z=

Use your calculator to find x, y and z

answer: 414,377,008

step-by-step explanation:

just multiply it

chiken

step-by-step explanation:

the first option is the answer.

the solution of the equation is 2.23 ⇒ answer b

step-by-step explanation:

* lets revise the meaning of exponential function

- the form of the exponential function is y = ab^x, where a ≠ 0, b > 0 ,  

  b ≠ 1, and x is any real number

- it has a constant base b

- it has a variable exponent x

- to solve an exponential equation, take the log or ln of both sides,  

  and solve for the variable

* lets solve the problem

∵

- the base is 7 and the exponent is x

- insert ㏑ in both sides

∴

- use the rule

∴ x ㏑(7) = ㏑(77)

- to find x divide both sides by ㏑(7)

∴

* the solution of the equation is 2.23 to the nearest 2 decimal places