## lunitaboo 2 years ago I cant seem to find the answer to this can anyone help me?

1. lunitaboo

2. jdoe0001

well, do you know how to do system of equations?

3. lunitaboo

yeahbut i cant seem to find the answer i get (4,6) -.- ? @jdoe0001

4. jdoe0001

$$\begin{matrix} 5x &+7y & =32 \\ 8x & +6y & =46 \\ \hline \end{matrix} \text{multiply the 2nd by -1}\\ \begin{matrix} 5x &+7y & =32 \\ 8x & +6y & =46 & \times -1 \\ \hline\\ ? & ? & ? \end{matrix}$$

5. Luigi0210

matrix seemed easier

6. drotzmann

its the last one... use cramers rules

7. drotzmann

(5,1)

8. jdoe0001

matrix? w000t?

9. jdoe0001

hmmm

10. jdoe0001

hold on

11. jdoe0001

-1 will not the trick

12. lunitaboo

thanks @drotzmann

13. amistre64

id suggest just testing out the options to see what fits ....

14. drotzmann

No problem, i do suggest using youtube to learn how to do Cramer's Rule

15. lunitaboo

omg i had totaly forgor that system @amistre64

16. lunitaboo

17. drotzmann

haha:)

18. jdoe0001

well, to cancel out the "y" I'd just do 6 * n = 7 n = 7/6 thus 6 * 7/6 = 7 that gives you a 7y at the bottom, thus cancelling out "y"

19. amistre64

in kindergarten, i was confronted by a hole shaped like a triangle, and 4 blocks oddly shaped blocks. instead of measuring stuff and trying to work out some complicated things ... i just picked up each block till i found the one that fit :)

20. jdoe0001

$$\begin{matrix} 5x &+7y & =32 \\ 8x & +6y & =46 \\ \hline \end{matrix}\\ \text{multiply the 2nd by -7/6}\\ \begin{matrix} 5x &+7y & =32 \\ -\frac{28}{3}x & -7y & =-\frac{161}{3} & \times \color{blue}{-\frac{7}{6}} \\ \hline\\ ? & 0 & ? \end{matrix}$$

21. drotzmann

@jdoe0001 ....one of us is on crack... i have no idea what you are doing. Cramer's Rule is so much more easier

22. jdoe0001

hehhe, yes, because is a 2x2, well, yeah, I gather you'd use that :)

23. drotzmann

three 2x2's to be correct ;)

24. jdoe0001

hehe, yes, not sure ... if it'd be .... I guess it depends I mean, off you have to get the discriminant, then 2 more discriminants

25. jdoe0001

determinants rather

26. drotzmann

yup:) exactly