6. If linear combination is the method used to solve this system of equations, what is the result of the first step? x + y = 6
x - y = 2

A. 2y = 8
B. 2x = 8
C. x + y = 8
D. x - y = 8

the answer is B

Step-by-step explanation:

x + x = 2x

y - y = 0

6 + 2 = 8

2x = 8

$5.41

step-by-step explanation:

$20 - $14.51 = $5.49.

explanation:

infrared radiation has wavelength in the range between 700 nm and 1 mm. lets' convert these values into scientific notation, keeping in mind that:

let's start from the lower value, we have:

(we moved the dot two places to the left, so we increased the exponent by 2 units, from -9 to -7)

the higher value is:

so, the range of wavelength of infrared radiation is: