Answer :
x = price of desktop computer (dollars)
y = price of laptop computer (dollars)
y = x + 400
x * 0.07 + y * 0.08 = 275
x * 0.07 + (x + 400) * 0.08 = 275
0.07x + 0.08x + (400 * 0.08) = 275
0.15x + 32 = 275
0.15x = 275 - 32
0.15x = 243
x = 243 / 0.15
x = 1620
y = 1620 + 400
y = 2020
y = price of laptop computer (dollars)
y = x + 400
x * 0.07 + y * 0.08 = 275
x * 0.07 + (x + 400) * 0.08 = 275
0.07x + 0.08x + (400 * 0.08) = 275
0.15x + 32 = 275
0.15x = 275 - 32
0.15x = 243
x = 243 / 0.15
x = 1620
y = 1620 + 400
y = 2020