The cost of 5 similar digital cameras and 3 similar video cameras is $3213. each video camera costs 4 times as much as each digital camera. John buys a digital camera and a video camera. How much does he pay?

Answer 1

5 x + 3 y = 3213
y = 4 x

5 x + 12 x = 3213

17 x = 3213

x = 189 for digital
4 x = 756 for video
sum = 945