Step-by-step explanation:

which means each person receive 45g cake
It is 0 because anything multiplied by 0 is 0.
1 and 2 are vertical
3 and 4 are adjacent
Answer:
y=2, x=-1
Step-by-step explanation:
We can add the two equations together to eliminate x:
6x+5y+(-6x)+7y=4+20
12y=24
y=2
We plug y into the first equation and get
6x+5(2)=4
6x+10=4
6x=-6
x=-1