## anonymous 4 years ago 3x - y = -4 5x + 4y = -8

1. anonymous

What do we have to do ?

2. anonymous

find the points that it would be on the graph

3. anonymous

Umm it would be on a graph oh darn lol i thought a fraction

4. anonymous

5. Mertsj

From the first equation y = 3x+4 Replace y in the second equation and solve. Can you do that this time?

6. anonymous

And some others that are a bit smart :P

7. anonymous

Solve simultaneously multiply Eq1 by4 and andd to Eq2 to get x

8. anonymous

x=-24/17

9. Mertsj

$5x+4(3x+4)=-8$

10. anonymous

I have 17x + 16 = -8. What to do after that?

11. Mertsj

Subtract 16 from both sides.

12. anonymous

for x I have -1.41

13. Mertsj

that it correct but it might be better to leave it in it's exact form which is -24/17

14. Mertsj

Because now you have to find y which is 3x+4

15. Mertsj

$y=3(-\frac{24}{17})+4$

16. Mertsj

$y=\frac{-72}{17}+4$

17. Mertsj

$y=\frac{-72}{17}+\frac{68}{17}=\frac{-4}{17}$

18. Mertsj

So the solution is (-24/17,-4/17)

19. anonymous

Thanks