How do you make 3x-7=(blank)x+12 have no solution?

Use the elimination method to solve the systems of equations.choose the correct ordered pair. 7x+4y=39

Will reward u brainliest! a restaurant did a survey among 100 customers to find their food preferences. the customers were asked about their preferences for pasta or rice. out of the total 30 people who liked pasta, 10 liked rice also. there were 40 people who liked rice. ok so all i need is someone to fill these in: like pasta and rice: like pasta, do not like rice: do not like pasta, like rice: do not like pasta or rice:

Let y = and z = . translate "z less than y" into an algebraic expression, and solve it.