#1**+1 **

Think of it this way, (2x+5y)+(3x+5)=180

Because the top line and the bottom line are parralel the two angles created by the line in between the parralel lines are supplementary and so they must also add up to 180.

Now use substitution.

because x=3y-5

2x+3y+2x+5y=180

substitute

12y-20+8y=180

20y=200

y=10

now substitute

2x+30+2x+50=180

4x=100

x=25

y=10 x=25

>=)

amathlete Mar 26, 2021