Answer:
the answer is 5 lines
Step-by-step explanation:
the equation would be
y= 40 + 15x
in this case y is $115
so that leaves you with:
115= 40 + 15x
115- 40 = 15x
75 = 15x
75/15 = 15/15x
5= x
they can have 5 cell phones.
x= -1
y=2
6x+5y=4
6x-7y=-20
Subtract
x=7/2 x=7/3
