Answer:
x = -2 , y = 4
Step-by-step explanation:
given:
5x + 2y = -2 <em>*4</em>
4x + 3y = 4 <em>*5</em>
Solving simultaneously,
20x + 8y = -8 ....eq 1
(-) 20x +15y = 20 ...eq 2
.............................................
-7y = -28
y = -28 / -7
y = 4
using equation 2,
20x +15(4) = 20
20x = -40
x = -2
![0=2t^3-21^2+40t](https://tex.z-dn.net/?f=0%3D2t%5E3-21%5E2%2B40t)
switch sides
![2t^3-21t^2+40t=0](https://tex.z-dn.net/?f=2t%5E3-21t%5E2%2B40t%3D0)
solve factoring
![t(t-8)(2t-5)=0](https://tex.z-dn.net/?f=t%28t-8%29%282t-5%29%3D0)
using the zero factor principle
![t=0 ](https://tex.z-dn.net/?f=t%3D0%0A)
solve
![t-8=0:t=8](https://tex.z-dn.net/?f=t-8%3D0%3At%3D8)
solve
![2t-5=0:t= \frac{5}{2}](https://tex.z-dn.net/?f=2t-5%3D0%3At%3D%20%5Cfrac%7B5%7D%7B2%7D%20%20)
![t=0,t=8,t= \frac{5}{2}](https://tex.z-dn.net/?f=t%3D0%2Ct%3D8%2Ct%3D%20%5Cfrac%7B5%7D%7B2%7D)
Hope this helps