3x-y=14
9x- =-27

use the method of substitution to solve

The solution to the system of equations is x=3 y= 23  

Step-by-step explanation:

solving this system of equation using substitution method  

 -3x-y=14 …..   equation (1)    

 -9x =-27   ….. equation (2)  

Solving for value of x from equation 2  

-9x =-27    

so x= -27/-9 = 3

so x = 3

The second equation is solved for x, so we can substitute the expression 3 in for x in the first equation (1)

-3x-y=14

-3 (3) + y =14  

-9+y= 14

y=14+9

y=23

The solution to the system of equations is x=3 y= 23  

We can check our work by plugging these numbers back into the original equations. Let's try -3x-y=14      

-3x-y=14      

-3(3) -23= 14

-9+23 = 14

14= 14

Yes, our solution checks out.

c

step-by-step explanation:

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116