2. in order to eliminate the y from this system of equations,
3x + 12y = 21
6x + 4y = 22
you could
(1) multiply both sides of the first equation by -2.
(2) multiply both sides of the second equation by -3.
(3) multiply both sides of the first equation by -3.
(4) multiply both sides of the second equation by 1/2.
: ( i’m stuck.

It's (2).

Step-by-step explanation:

(2) Multiply both sides of the second equation by -3. That would create the following equation:

-18x - 12y = -66.

Adding this to the first equation will eliminate y.

i got 10.28 but that rounds up to 10.3

the correct option is 2.

step-by-step explanation:

according to the given information triangle abc is a right angle triangle with right angle at a. segment ab is 5 and segment ac is 7. point d is on segment bc and angles adb and adc are right angles.

it is given that triangles abd, cad, and cba are similar.

two triangles are similar if their corresponding sides are proportional.

in triangle cba, using pythagoras theorem

                      )

triangle abd and cba are similar,

                            (2)

triangle cad and cba are similar,

                      )

using (1), (2) and (3), we get

hence proved.

therefore option 2 is correct.