Answer:
A book is worth $1 and a DVD is worth $12.
Step-by-step explanation:
The equations (2 unknowns and two equations, d is for a DVD and b is for a book):
For David: 3d+4b=40
For Anna: d+6b=18
Now multiply the second equation with -3 and add to the first equation:
3d+4b=40
−3d−18b=−54
Combined equation: −14b=−14 and b=1 (means that each book is worth $1).
Now for DVD price, use the second equation:
d=18−6 or d=12 (means that each DVD is worth $12).
A book is worth $1 and a DVD is worth $12.
اختي هلق اذا نزلنا من الزاوية الثانية خط منحسن نلاقي مستطيل ونحيب مساحته ويلي هية ١٢ متر مربع
بعدين منطلع الضلعين الموجودين يلي لح يكونو نفس القيمة
يعني هوو كمان مستطيل ١٤×٤=٥٦
٥٦+١٢=٦٨
يعني الجواب ٦٨ متر مربع ان شاء الله يكون صح لاني حليته نظرياً
Same=same figure out what the x is both x are the same number on both side is the same answer hope that helps
Answer:
3x + 3, 4x+2, 5x+1
Step-by-step explanation:
what are equivalent to2x+4