Question

Where do the lines intersect?

y = 3x + 4
y = −x + 8

Choices:
(4, -4)
(2, 8)
(1, 7)

Please help, I can't figure this out from Google-ing around and OVCA didn't send out Math books for me to study.

Answer 1

Okay so what you should do is plug in the numbers for x and y. Lets start with 4,-4.
-4=3(4)+4 when you multiply 3 times 4 then add 4 do you get -4?

Answer 2

No @Softballstar201, I get 16

Answer 3

You need to eliminate the x value by combining the two equations

Answer 4

Exactly so then you keep plugging in the numbers until the values equal y.

Answer 5

How do I combine equations, @nelsonjedi

Answer 6

Oh, let me try that @Softballstar201

Answer 7

or you could do what @nelsonjedi did because you still will get the same answer practically

Answer 8

Is it (1, 7), @Softballstar201?

Answer 9

Now compbine the equations to solve for y

Answer 10

Yes @ToxicInsanity

Answer 11

That seems much more complicated, @nelsonjedi... >_<

Is something about that way better than @Softballstar201's way?

Answer 12

1 and 7 is correct but plugging in numbers from set of solutions does not show you how to solve the problem

Answer 13

Actually when I was in middle school we learned it both ways but the easier way would be to do what I did.

Answer 14

Thank you, thank you @Softballstar201

@nelsonjedi Uhh, how come? I'm solving it aren't I, just in a different way. How is solving it not solving it. XD

Answer 15

No problem @ToxicInsanity

Answer 16

@Softballstar201 How do I give you a medal? :D

Answer 17

What happens when you get a question and are not given a list of possible answers.

Answer 18

So far I haven't, @nelsonjedi, but if I ever do, I'll take into consideration you're technique of solving it.