Can anyone help me with the matrix ? I will become a fan and i will give you a medal *questions are below *

Question

anonymous · Answer

attachment

anonymous · Answer

|dw:1433186322955:dw|

anonymous · Answer

&& i don't need help with #5 , i just want to know if it's right ... even tho im 75%sure it is right lol

misty1212 · Answer

which one?

anonymous · Answer

first one

misty1212 · Answer

it is going to be very hard for me to write, but it is easy to do 
first multiply each entry in A by $-3$

misty1212 · Answer

it is going to be very hard for me to write, but it is easy to do 
first multiply each entry in A by $-3$

misty1212 · Answer

then multiply each entry in B by $6$

misty1212 · Answer

then add entry by entry

anonymous · Answer

to make it easier .. is there like a formula to this ?

misty1212 · Answer

at the risk of sounding silly, you are given the formula 
multiply by -3, multiply by 6 and add

anonymous · Answer

oh , & that's all i have to do ?

misty1212 · Answer

$$-3\begin{bmatrix}
    -3& 5& -6\
    9 & -5 & 3 
  \end{bmatrix}$$
$$=\begin{bmatrix}
    9& -15& 18\
    -27 & 15 & -9
  \end{bmatrix}$$

misty1212 · Answer

yeah then do the same to the next one 
then add entry by entry 
that is all

anonymous · Answer

oh I see , Thank you for your help

misty1212 · Answer

$$\color\magenta\heartsuit$$

anonymous · Answer

my answer : -3  21 60
                    -15 9 -45