Answer:
x=-4
Step-by-step explanation:
-18=2+5x
Subtract 2 from both sides
-20=5x
-4=x
180-2(55)-x=0
180-110-x=0
70-x=0
-x=-70
x=70°
7,215: 34 = 0,212205882352941
Y=2x+1
x+y=7
x+(2x+1) =7
3x+1=7
-1 -1
3x=6
x=2------------> Y=2x+1
y=2(2)+1
y=5
X=2
Y=5