Algebra-1

Let x be the amount invested in stocks at 15%.

Let y be the amount invested in bonds at 6%.

Total Investment Equation: x + y = 8000

Annual Return Equation: The return from the stocks is 0.15x and from the bonds is 0.06. The total return is $930: 0.15x + 0.06y = 930

From the first equation, express y in terms of x: y = 8000 − x

Substitute y = 8000 − x into the second equation: 0.15x + 0.06(8000 − x) = 930