Solve the system of linear equations using matrices.

-x = 2 + 5y + 5z
-5y + 4z = 19 - 4x
x + 5y - z = -20

Rewrite each equation in form ax+by+cz=d

x +
y +
z=

x +
y +
z=

x +
y +
z=

Use your calculator to find x, y and z

for finding the midpoint of any given 2 pair of points simply add the respective x coordinates with other x coordinate and the y coordinate with other y coordinate and divide them by 2

in your question it will be :

(3+1)/2 for the x coordinate of mid point i.e 2

[8+(-4)]/2 for the y coordinate of midpoint i.e 2

so coordinates of mid point of points (3,8) and (1,-4) will be (2,2)

not sure but it may be b, as i said i'm not sure.

the answer is -6

step-by-step explanation:

the answer is -6 because its next to the variable m

yes, gavin is right.

step-by-step explanation:

gavin is correct. 

this problem is about converting 9% per year to how many percent per quarter. the rate is still the same. it only differed in the time period. so, through dimensional analysis,

9% per year  × (1 year / 4 quarters) = 2.25% per quarter

if he was asked to convert 9% per year to how many percent per quarter  compounded quarterly, then you will not simply divide by four. this is because compounding is not linear.

hope this , have a good day. c;