kaitlynnmarietwichel kaitlynnmarietwichel 19-02-2021 Mathematics contestada I. 2a + 2b - c + d = -5II. a + b + d = -2III. 3a - b + 2c -d = 18IV. 4b = -cHint:Solve for c first in IV.Solve for any variable in II next.Solve I then.