Question

Solve the following system of equations by linear combination:
3d – e = 7
d + e = 5


There is no solution.
There are an infinite number of solutions.
The solution is (3, 2).
The solution is (2, –1).

Answer 1

3d - e = 7
d + e = 5
---------add
4d = 12 -- divide by 4
d = 3
now sub 3 in for d in either of the equations
d + e = 5
3 + e = 5
e = 5 - 3
e = 2
solution is (3,2)

Answer 2

any questions ?

Answer 3

no, thanks you

Answer 4

YW :)