4x + 8y = 20 and -4x + 2y = -30

Step-by-step explanation:

Given :-

Adding the equations :-

10y = -10

y = -1

Put it (i) :-

4x - 8 = 20

4x = 20 + 8

4x = 28

x = 28/4

x = 7

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

for the free

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