I think it is the 3rd one, but I could be wrong. please go check out my question and see if you can help.
Answer:
a right angle
Step-by-step explanation:
Answer:
8n+5=6
Step-by-step explanation:
So you subtitute y=3x into
2x+y=15
so
2x+(3x)=15
add like terms
5x=15
divide both sides by 5
x=3
subtitute x=3 into first equation (y=3x)
y=3(3)
y=9