Answer:
y = 8000
Step-by-step explanation:
0.13y + 0.03(y + 7000) = 1490
Multiply out .03
0.13y + 0.03(y + 7000) = 1490
.13y + .03y + .03*7000 = 1490
.13y + .03y + 210 = 1490
.16y + 210 = 1490 Subtract 210 from each side
.16y + 210 - 210 = 1490 - 210
.16y = 1490 - 210
.16y = 1280 Divide each side by .16
.16y/.16 = 1280/.16
y = 1280/.16
y = 8000
Check
0.13y + 0.03(y + 7000) = 1490
0.13(8000) + 0.03(8000 + 7000) = 1490
0.13(8000) + 0.03(15000) = 1490
1040 + 450 = 1490
1490 = 1490
