Answer: Second option.
Step-by-step explanation:
Let be "e" the number of easy puzzles Tina solved and "h" the number of hard puzzles Tina solved.
Set up a system of equations:
![\left \{ {{e+h=50} \atop {30e+60h=1,950 }} \right.](https://tex.z-dn.net/?f=%5Cleft%20%5C%7B%20%7B%7Be%2Bh%3D50%7D%20%5Catop%20%7B30e%2B60h%3D1%2C950%20%7D%7D%20%5Cright.)
You can use the Eliminationn Method to solve this system of equations:
- Multiply the first equation by -30.
- Add the equations.
- Solve for "h".
Therefore, through this proccedure, you get:
![\left \{ {-30e-30h=-1,500} \atop {30e+60h=1,950 }} \right.\\.........................\\30h=450\\\\h=\frac{450}{30} \\\\h=15](https://tex.z-dn.net/?f=%5Cleft%20%5C%7B%20%7B-30e-30h%3D-1%2C500%7D%20%5Catop%20%7B30e%2B60h%3D1%2C950%20%7D%7D%20%5Cright.%5C%5C.........................%5C%5C30h%3D450%5C%5C%5C%5Ch%3D%5Cfrac%7B450%7D%7B30%7D%20%5C%5C%5C%5Ch%3D15)
Answer:
mecury,jupiter,uranus,neptune
Step-by-step explanation:
Answer:
x = -16/13
Step-by-step explanation:
17x + 14 = 4x - 2
13 x = -16
x = -16/13