Answer:
-3
Step-by-step explanation:
since the 9 in negative you subtract 9 by 6 and you get 3 then you put the negative sign in front of the 3 making it -3
19^2 + x^2 = 21^2
19^2 = 361
21^2= 441
361 + x^2 = 441
x^2 = 441-361 = 80
x = sqrt(80) = 8.944 round to nearest tenth = 8.9
-x-y=1
-y=1+x
y=-1-x
-1-x=-2x+9
-x=-2x+10
x=10
y=-1-10
y=-11
you have to solve for X is somthnking
Check the picture below.
make sure your calculator is in Degree mode.