Solve the indicated or given systems of equations by an appropriate algebraic method.

Two grades of gasoline are mixed to make a blend with 1.50% of a special additive. Combining x liters of a grade with 1.80% of the additive to y liters of a grade with 1.00% of the additive gives 10,000 L of the blend. The equations relating x and y are

Find x and y (to three significant digits).

x + y = 10,000 0.0180x+0.0100y = 0.0150(10,000)