Which equation is equivalent to 2 - 4/5​

98 point question what is the record for most points in one

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me

Will mark 50 show all what is the solution to the system of equations? use the substitution method and show your work. -5x+y= -3 -15 x+3y=7 explain what your answer in part (a) tells you about the association of the lines in this system.