Answer:
35 cars in 5 days
Step-by-step explanation:
Let x = total of days when both dealers tie
y = total of cars sold when both dealer tie
Total of car Summerfield sell when both dealers tie :
y = 5 + x × 6
y = 5 + 6x
Total of car Stephenson sell when both dealers tie :
y = 20 + x × 3
y = 20 + 3x
System of equations :
[tex]\left \{ {{y=5+6x} \atop {y=20+3x}} \right.[/tex]
y = 5 + 6x
y = 20 + 3x
------------------- (-)
0 = -15 + 3x
3x = 15
x = 5 days
y = 5 + 6x
y = 5 + 6(5)
y = 35 cars