Which system of equations has exactly one solution? 2 x minus 4 y = 8. x + y = 7.
3 x + y = negative 1. 6 x + 2 y = negative 2.
3 x + 3 y = 3. Negative 6 x minus 6 y = 3.
3 x minus 2 y = 4. Negative 3 x + 2 y = 4.

The distance between mike’s house and the grocery store is 4/5 of a mile. mike has walked 1/2 of a mile from his house to the grocery store. how much farther does he needs to walk to reach the grocery store? a. 13/10 miles b. 3/4 of a mile c. 3/10 of a mile d. 2/5 of a mile