Here is a system of linear equations: {2x+1/2y=7 6x−1/2y=5.
1. Which would be a more helpful for solving the system: adding the two equations or subtracting one from the other?
explain your reasoning
2.solve the system without graphing
show your reasoning

Pleas help me I would appreciate it if you did

Apsychology student wishes to investigate differences in political opinions between business majors and political science majors at her college. she randomly selects 100 students from the 260 business majors and 100 students from the 180 political science majors. does this sampling plan result in a simple random sample? why or why not? no, because each group of 200 students in the sample does not have the same chance of being selected. yes, because each group of 200 students in the sample has the same chance of being selected. no, because each individual student does not have an equal chance of being selected. yes, because each individual student has the same chance of being selected.

What value of x is in the solution set of 4x – 12 s 16 + 8x?

Acomputer store buys a computer system at a cost of $370.80. the selling price was first at $ 618, but then the store advertised a 20 % markdown on the system. answer parts a and b. a. find the current sale price.