Posted by Suzanne on Wednesday, February 18, 2009 at 4:58pm.
Solve each system graphically.
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 5:03pm
you can try substitution
x-3(4x-9) = 16
x - 12x + 27 = 16
- Algebra - Reiny, Wednesday, February 18, 2009 at 5:14pm
Didn'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
for the second:
x - 3y = 16 ---> x = 3y + 16
graph both lines, they should intersect at (1,-5), the answer chopsticks gave you.
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