Question

Solve x + 3y = 9
3x - 3y = -13
Question 7 options:
1) (-1, 10/3 )
2) (1, -10/3 )
3) (-1, 3/10 )
4) (1, -3/10 )

Answer 1

1) (-1, 10/3 )

Answer 2

Solve for x to get x = 9-3y

Now work with the 2nd equation and plug in x = 9-3y

3x-3y=-13

3(9-3y)-3y=-13

27-9y-3y=-13

-12y=-13-27

-12y = -40

y = -40/(-12)

y = 10/3


Now plug this back into x = 9-3y and solve for x

x = 9-3y
x = 9-3(10/3)
x = 9-10
x = -1

So the two solutions are x = -1 and y = 10/3 giving us the ordered pair (-1,10/3)

Answer 3

Hip, you copied wrong!

Answer 4

yeah you lost y somewhere...

Answer 5

Lol.