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March 31, 2015

March 31, 2015

Posted by **Suzanne** on Wednesday, February 18, 2009 at 4:58pm.

#6.

4x - y = 9

x - 3y = 16

I need to find at least one pair of points that fit. I tried using the elimination method and got (5 and 6/7, -22), which did not even work for the first equation.

I also tried graphing it but it was too hard to tell.

Can anyone help me with solving this?

Thanks so much! :-)

- Algebra -
**Chopsticks**, Wednesday, February 18, 2009 at 5:03pmyou can try substitution

y=4x-9

x-3(4x-9) = 16

x - 12x + 27 = 16

-11x=-11

x=1

4-y=9

y=-5

(1,-5)

- Algebra -
**Reiny**, Wednesday, February 18, 2009 at 5:14pmDidn't your question ask for a graphical solution?

so you have to find at least 2 ordered pairs for each equation and then draw them

for the first:

4x - y = 9 ---> y = 4x - 9

x y

1 -5

3 3

for the second:

x - 3y = 16 ---> x = 3y + 16

x y

4 -4

-2 6

graph both lines, they should intersect at (1,-5), the answer chopsticks gave you.

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