Lisa invest $4000 in two types of bonds , bond a and bond b a offers 10%return . lisa invest $x and $y inbond b her tostados investment is 350. the system of linear equations defining the situation is a. x+y=4000and 10x+6y=340 b. x+y=4000and 0.06x+0.1y=340 c. x+y=340and 0.1x+0.06y=4000 d. x+y=4000and 0.1x+0.06y=340 the amount lisa invest ed at the rate of 10%is a.1000 b.1500 c2500 d3500 and the amount she invested at the rate of 6%is a. 500 b1500 c2500 d3000