Question Solve the system of equations Solve using the substitution method Solve using the elimination method Solve using the Gauss-Jordan method Load more (a,d)=(21,−21)Alternative Form (a,d)=(0.5,−0.5) Evaluate {a=−d−d=21Solve the equation for d {a=−dd=−21Substitute the given value of d into the equation a=−d a=−(−21)Simplify a=21Calculate {a=21d=−21Check the solution More Steps Check the solution {21=−(−21)−(−21)=21Simplify {0.5=0.50.5=0.5Evaluate true {a=21d=−21Solution (a,d)=(21,−21)Alternative Form (a,d)=(0.5,−0.5) Show Solution