Question

SUMMER MATH PACKET!! Please help check my answers?? Thanks!
Directions: Solve.
1. 3y-20-y=6-3y-6
my answer: y=4
2. -3x greater than equal to 15
my answer: x greater than equal to 5
3. 3y-9<6+6y
my answer: y<5
4. 1/4 (x-2) - 1/5 (x-3) = 1/2
my answer: x=8
5. -3x+3y=-18
4x-y=5
my answer: x=-13/9 and y=-67/9
6. 2x-3y=8
5x+2y=1
my answer: x=1 and y=-2
7. 2+x/5=5
my answer: x=23
8. (x+3)(x-9)=0
my answer: (-3,9)

Answer 1

ways to check your answer

Answer 2

http://www.wolframalpha.com/input/?i=3y-20-y%3D6-3y-6&dataset=

Answer 3

go to wolframalpha and type your equation

Answer 4

so 1st one is correct

Answer 5

the second one is wrong... when you divide by a negative you have to change the direction of the sign

Answer 6

how is the second one wrong? I divide -3 by 15 and get 5. and keep the greater than equal to sign...right??