Answer:
I dont see any lines?
Step-by-step explanation:
Let
A------------> <span>number of children
B------------> </span><span>number of adults
we know that
0.40A+0.70B=5.90--------------------------> equation 1
A+B=11------------> A=11-B----------------> equation 2
using a graph tool------------> to resolve the equations system
see the attached figure
the solution is
A=6
B=5
the answer is
A is bigger</span>
7-x=15
7-(-8)=15
what we have to do in order to solve this is change the 2 subtraction signs into a addition sign because a negative plus a negative makes a positive.