Question

Solve the following system of equations by linear combination
3d – e = 7

d + e = 5

Answer 1

whats the topic? @omw2fyb

Answer 2

ok :)

Answer 3

If you add them straight down:

2d-e = 7
d + e = 5

Then the e's cancel out.

You are left with 3d = 12

Then solve for d by dividing each side by 3.

Now you have d =4.

To solve for e go back into one of your original equations and substitute 4 for the d.

You can use either equation, so I'll choose the second one.

4 + e = 5
Now solve for e by subtracting each side by 4.

Now you have e = 1.

So your solutions are d = 4 and e = 1

Answer 4

~~ http://brainly.com/question/253850