Question

http://prntscr.com/9mmx53

Answer 1

Solve for one variable and plug it to another equation.

Answer 2

Are you familiar with using the substitution method?

Answer 3

kind of

Answer 4

choose one of the 2 given equations and solve it for either "d" or "e."

Answer 5

Please choose one of the equations. Which will it be? (Doesn't matter which one.)

Answer 6

d=e

Answer 7

@pooja195

Answer 8

\(\color{#000000 }{ \displaystyle d+e=2 }\)
\(\color{#000000 }{ \displaystyle d-e=4 }\)

Answer 9

You can play with the second equiation.

If you add e to both sides of the second equation, then you will get
\(\color{#000000 }{ \displaystyle d-e\color{red}{+e}=4 \color{red}{+e} }\)
\(\color{#000000 }{ \displaystyle d=4+e }\)

Answer 10

You can tell based on this (on d=4+e), that d and (4+e) are the same thing.

So, you can substitude "4+e" into the firt equation, instead of d.

Answer 11

4+e=2

Answer 12

\(\color{#000000 }{ \displaystyle d+e=2 }\)
\(\color{#000000 }{ \displaystyle (4+e)+e=2 }\)

Answer 13

this is your substitution