the sum of measures of all angles of a quadrilateral is 360
5x+4x+6y+3y=360
9x+9y=360
9[x+y]=360
x+y=40 dividing by 9
x=40-y
let y=20
then the value of x=20
then take any two values of y as y=20
then draw graph of this assumed values of x and y
there you will get point of intersection and it is the value of [x,y]
substitute it in 5x,4x,6y,3y
joint the points and you will get reqiuared quadrilateral
i hope you are understanding I dont know how to draw graph on computer
sorry for grammar mistakes