All answers are correct
Similar situation as you have before, let's starts from the easiest one which is D
2y = x
solve for y and you have y =x/2 which will show you on graph straight line
3/4y = 6x
multiply by 4/3
y = [(6*4)/3]x
y=(24/3)x
y=8x
also straight line :)
y=2/5x-2/5 is same as y=0.4x-0.4 also will result as straight line graph :)