Transform the given system x₁' = 4x₁ - 10x₂, x₂' = 10x₁ - 7x₂ into a single differential equation of second-order for x₁
a) x₁'' + 11x₁' + 34x₁ = 0
b) x₁'' - 11x₁' + 34x₁ = 0
c) x₁'' + 11x₁' - 34x₁ = 0
d) x₁'' - 11x₁' - 34x₁ = 0