Answer:
no,yes,no,yes
Step-by-step explanation:
if you wanna check if a relation is function or not , you can simply check if you have more than one x with same y.for example : for the first relation, you have (2,5) and (2,7) . so this isnt a function
the answer would be true
x=3k
y=3k
z=4k
x+y+z=180
3k+3k+4k=180
10k=180
k=180/10
k= 18
z=4*18
z=72
answer: 72
