Solve the linear system
1).5x + 4y = 16
y = -16
2). 3x + 6y = 15
-2x + 3y = -3
3). 7y = -14x + 42
7y = 14 x + 14

The first week samantha learned to read braille, she could read 10 words per minute. in the second week she increased her speed by 20%. in the third week she increased her speed again by another 25%. how many words could she read per minute by the third week? hurry and tell me!