I need 4 answers done, I need you to tell me how to do it, and show your work for the answers!

13)

14)

15)

16)

Step-by-step explanation:

13)

Sub in equation 1 into equation 2.

Expand the bracket.

Rearrange.

Solve for y.

14) (Following exactly the same steps)

15) (Following exactly the same steps again.)

16) (Still no variation on how the questions are asked, exact same method)

idk man good luck man

d) by the cross product property, ab^2 = bc multiplied by ad

step-by-step explanation:

we are given

in the given triangle abc

angle a is 90° and segment ad is perpendicular to segment bc

we can see that

triangle(abc) and triangle(abd) are similar because they have common side and same angle (90 degree)

so, triangles(abc) and abd are similar

since, they are similar

so, the ratio of their sides must be equal

we get

now, we can cross multiply

and we get

so, this could be step to prove it