Part A: -x+y=5
+x +x
y=x+5
4x+x+5=10
5x+5=10
-5 -5
5x=5
x=1
1(-x) +y=5
-1+y=5
+1 +1
y=6
The solution is (1,6)
Part B:
-x+y=5
-1+6=5
5=5
4x+y=10
4(1)+6=10
4+6=10
10=10
At x=-2, f(x)=-1. at x=4, f(x)=-13.
The equation would be y = 3x + 15.
Since there is a flat rate of 15, that is your y-intercept. The $3 charge is variable and depends on the number of days, so that would represent your slope.
0 , this is because it is a 6 sided die therefore it will be impossible to land on a 7