What is the y-coordinate for the solution of the system of equations below? 7y+5x=19 3y+5x=7

2 answers:

7 0

I would go about solving this by elimination because the x variables are already the same so all you would have to do is change one equation to the opposite signs and add them, so it would look like:

7y + 5x = 19
+ -3y - 5x = -7
-------------------
4y=12
y=3

IceJOKER [234]3 years ago

6 0

7y + 5x = 19 ⇒ 21y + 15x = 57
3y + 5x = 7 ⇒ 21y + 21x = 49
 -6x = 8
 -6 -6
 x = -1 1/3
 7y + 5x = 19
 7y + 5(-1 1/3) = 19
 7y - 6 2/3 = 19
 +6 2/3 +6 2/3
 7y = 25 2/3
 7 7
 y = 3 2/3
 (x, y) = (-1 1/3, 3 2/3)

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