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44 votes
44 votes
Hi! I need help on this khan academy equation. If you can, please explain how to do other problems like this too. ): Thank you if you answer <3

Hi! I need help on this khan academy equation. If you can, please explain how to do-example-1
User Fernando Silveira
by
2.7k points

2 Answers

11 votes
11 votes

Answer:

c is the right answer

Explanation:

User Dbarenas
by
2.6k points
17 votes
17 votes

Answer:

C

Explanation:

x + 2y = 6

isolate x through

x = 6-2y . . . (iii)

Substitute equation (iii) in equation (i)

7x - y = 7

7(6 - 2y) - y = 7

42 - 14y - y = 7

42 - 15y = 7

Collecting Like terms

-15y = 7 - 42

-15y = -35

-15y = -35

-15 -15

y = 7

3

y =


2(1)/(3)

Substitute y in equation (iii)

x = 6 - 2y

x = 6 - 2 × 7

3

x = 6 - 14

3

x =


1(2)/(3)

User Sam Storie
by
2.4k points