Nadia bought a new camera, lens and case. she round rounded the cost of the camera to $800, the cost of the lens to $500 and the cost of the case $200. the actual cost of all three items was $1,489. what could be the actual cost of each item?

step-by-step explanation:

step 1: solve one of the equations for one of the variables. let's solve the first equation for y:

step 2: substitute that equation into the other equation, and solve for x.

step 3: substitute x = 4 x = 4 x=4 into one of the original equations, and solve for y.