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(2x+40)+ (x+80)=180
3x+120=180
3x=180-120
x=60:3
x=20
—
2x+40=180
2x=180-40
2x=140
x=140:2
x=70
—
x+80=180
x=180-80
x=100
—
y=x+80=180
y=20+80=180
y=180-(20+80)
y=80
D. x=180-102=78
E. x & y=?
5x+80=180
5x=180-80
x=100:5
x=20
5x= 5×20=100
7y= (80+5x)+ (180-100)
7y=180+80
7y=260
y=260:7
y=37,1
7y=7×37,1
7y=259,7