So on the first one, check the first picture, solve for "x" and "y" respectively
on the second one, check the second picture, the left-half, solve for "x"
on the last one, are they similar? check the second picture, right-half
on the second one, check the second picture, the left-half, solve for "x"
on the last one, are they similar? check the second picture, right-half