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6x-3y=15, 7x+4y=10

0 votes
I just need to solve this using Elimination. Thanks
asked Oct 20, 2018 in PRE-ALGEBRA by NerdyPorcupine Rookie

1 Answer

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The Simultaneous equations are

6x - 3y  =  15 ----------------> (1)

7x + 4y  =  10 -----------------> (2)

Multiply Eq (1) with "4" and Eq (2) with "3" and add them

Eq (1) X 4  ========>  24x  - 12y  =  60

Eq (2) X 3  ========>  21x + 12y  =  30

                                -----------------------------------

                                             45x  =  90   

                                             x  =  90/45

                                             x  =  2

Substitute x = 2 in Eq (2)

7(2) + 4y  =  10

14 + 4y  =  10

4y  =  10 - 14

4y  =  -4

y  =  -4/4

y  =  -1

Answer :

The Solutions are x = 2 and y  =  -1.

answered Oct 21, 2018 by homeworkhelp Mentor

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