2x-3y=12 2x+6y=-24 find x& y by elimination

Simplify the expression and find the missing terms. the simplest form of has in the numerator and in the denominator.

Thompson and thompson is a steel bolts manufacturing company. their current steel bolts have a mean diameter of 127 millimeters, and a variance of 36. if a random sample of 35 steel bolts is selected, what is the probability that the sample mean would differ from the population mean by greater than 0.5 millimeters? round your answer to four decimal places.

Graph the equationy= x+3[tex]y = x + 3[/tex]