Solve for x stuck on this one plz help

x = 18

Step-by-step explanation:

Remember supplementary angles equal 180°!

180 = 69 + (6x+3)

111 = 6x + 3

108 = 6x

18 = x

x=18

Step-by-step explanation:

180-69=111

111-3=108

108/6=18

3

step-by-step explanation:

because where the point where the 2 lines intersect is (3,-1) the x value is 3

system of linear equation

step-by-step explanation:

as given in the data

a= 20 , b= -12

let us suppose that it is a straight line equation

now we know the formula for the system of linear equation

b= ma + c )

here m is slope of a straight line which is equal to formula

m=   (ii)

and here c is a constant

now putting the value of a and b in equation (ii)

m=

m=

putting the value of a,b and m in equation (i) gives us

-12 = + c

-12=-12 + c

adding 12 to both sides

-12 +12 = -12 +12 +c

0 =c

or c=0

as the value of the constant is zero which gives us that it is a linear equation and this order pair satisfies the system of linear equations.