What is the answer to y=3/4x+2 ???

Solve the system of equations y= 3/2 - 1, -x+ y =-3

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .

Ithink i know it but i want to be sure so can you me out ?