A computer system consisting of a monitor, a keyboard, and a cpu with a hard drive costs $1,800. The monitor costs $300 more than the keyboard, and the CPU costs $900 more than they keyboard. Find the cost of the keyboard.Show me how you arrived at the answer.
K+M+C1800 K+300M K+900C K+(K+300)+(K+900)1800 3K1800-900-300 3K600 K200 M500 C1100
suppose : m : the cost of monitor k : the cost of keyboard c : the cost of CPU so, we can derive the formula : m + k + c 1,800 we know that : m k + 300 and c k + 900 if we substitute them to the formula above, we get k + 300 + k + k + 900 1800 3k + 1200 1800 3k 600 k 200
x+y+z1800 x keyboard y monitor z cpu yx+300 zx+900 x+x+x+300+9001800 3x+12001800 3x600 x200 keyboard y 500 monitor z1100 cpu
Total price 1800Keyboard+Monitor+CPU Keyboard? Monitor300+Keyboard CPU900+Keyboard thus subsituting in: 1800 Keyboard +300+Keyboard +900+Keyboard 1800-300-900 3* Keyboard 6003*Keyboard 600/3Keyboard $200
