Answer:
x =20
Step-by-step explanation:
As a line is 180 degrees
So 7x + 40 would be 180, which would lead us with the equation:
7x+40=180
=7x =140 (minus both sides by 40)
=x =20 (divide both sides by 7)
y and x are variables, the 5 in 5y is a coefficient so is the 4 in 4x, the 3 is called a constant
x =-4
y=-1
x=2
y=8
okeeeeeeeeeeeyyyyyyyyy
