13) y = 8x + 13
- 4x - 5y = 23

x=42/44

Step-by-step explanation:

Because y=8x+13, You will have to insert 8x+13 into y.

-4x-5(8x+13)=23

distribute 5(8x+13)

5(8x)+5(13)

40x+65

Now you have this equation: -4x-40x+65=23.

subtract -65 on both sides

-4x-40x+65-65=23-65

-4x-40x= -42

Solve the x: -4x-40x= -44x

Now you have -44x=-42

Divide 44 on each sides

-x=-42/44

x=42/44

(simplified: 21/22)

30

step-by-step explanation:

idk

i hope i

the correct option is 2.

step-by-step explanation:

according to the given information triangle abc is a right angle triangle with right angle at a. segment ab is 5 and segment ac is 7. point d is on segment bc and angles adb and adc are right angles.

it is given that triangles abd, cad, and cba are similar.

two triangles are similar if their corresponding sides are proportional.

in triangle cba, using pythagoras theorem

                      )

triangle abd and cba are similar,

                            (2)

triangle cad and cba are similar,

                      )

using (1), (2) and (3), we get

hence proved.

therefore option 2 is correct.