Solve the simultaneous equation using elimination method x + 4 = 6 and x- 2y=18

Step-by-step explanation:

Write x + 4 = 6 and x- 2y=18 vertically:

x + 4 = 6

x - 2y =18

Multiply the 2nd row by -1, obtaining:

x + 4 = 6

-x + 2y = -18

(2, -8)

Combine the two equations:

x + 4 = 6

-x + 2y = -18

       2y + 4 = -12, or 2y = -16, or y = -8.

We can tell immediately from the first equation that x = 2.

Thus, the solution is (2, -8).

Does this satisfy the second equation?

Is (2) - 2(-8) = 18  true?

Is 2 + 16 = 18 true?  YES.

9.55 degrees.

step-by-step explanation:

the given angle is

1 cycle is equal to 2π radians. so 4π will be equal to two cycles.

5.166667π-4π = 1.166667π

hence, this angle goes a little more than negative x axis.

1.166667π-π= 0.166667π

hence, the reference angle is 0.166667π radians.

1 radian = 57.2958 degrees

now, in degrees, this should be equals to 9.55 degrees.