Let M′=(4,−3)=(x′,y′) θ=135∘ Let coordinates of M be (x,y) we have, x=x′‌cos‌θ−y′‌sin‌θ and y=x′‌sin‌θ+y′‌cos‌θ ⇒‌‌x=4⋅cos‌135+3‌sin‌135∘ and y=4⋅sin‌135∘+(−3)‌cos‌135∘ ⇒‌‌x=4⋅(‌