Solve the simultaneous equations for x and y: 4 x + 3 y = − 12 2 x − 3 y = 30

Step-by-step explanation:

4x + 3y = -12    (I)

2x - 3y  = 30    (II)

Add the equations. So, y will be eliminated and we can find the value of x

4x + 3y = -12

2x  - 3y = 30

6x        =  18

x = 18/6

x = 3

Plug in the value of x in equation (I)

4*3 + 3y = -12

12 + 3y = -12

       3y = -12 - 12

      3y = -24

        y = -24/3

       y = -8

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: