Which rock has the highest metamorphic grade? rock formed at 500? ? c and 8 kilobars of pressure rock formed at 1,200? ? c and 20 kilobars of pressure rock formed at 400? ? c and 12 kilobars of pressure rock formed at 700? ? c and 10 kilobars of pressure

To solve this system of equations by elimination, what operation could be used to eliminate the y-variable and find the value of x? 6x + 5y = 2 4x + 2y = 8 a) subtract 2 times the second equation from 3 times the first equation b) subtract 3 times the second equation from 2 times the first equation c) subtract 5 times the second equation from 2 times the first equation d) subtract 2 times the second equation from 5 times the first equation