Solve the system using the substitution method. The Question the the screenshot below.
Please and thank you.

Step-by-step explanation:

substitute y

7x-8(-2x) = -23

multiply

7x+16x= -23

add like terms

23x=23

divide

x=1

y= -2x

y= -2(1)

y= -2

add an image

step-by-step explanation:

hope it you

step-by-step explanation:

sin(7pi/6 - pi/3)  

= sin(7pi/6 - 2pi/6)  

= sin(5pi/6)  

= sin(pi - pi/6)  

= sin(pi/6)  

= 1/2  

sin 7pi/6 - sin pi/3  

= sin (pi + pi/6) - sin pi/3  

= -sin pi/6 - sin pi/3  

= -1/2 - sqrt(3)/2  

= -(1+sqrt(3))2