Add it all together and divide it by 2 the answer is 10
Slopt in form ax+by=c is -a/b
-3/3=-1
slope is -1
intercept in form ax+by=c is c/b
63/3=9
slope is -1
intercept is at y=9
Answer:
Yusuf got 19 toffees
Step-by-step explanation:
The problem tells us that if Yusuf counts his toffees in 4's, he has 3 left. Let's call the number of toffees "t", then we know that
≡
We also know that
≡
Between 10 and 20, there are only 2 numbers t≡
, these numbers are 14 and 19.
However, 14≡
so it doesn't add up.
On the other hand, 19 ≡3
and therefore, this is the answer.