Question

Last question:
2a -7 = -9 I have to solve for a.

Answer 1

-1

Answer 2

\[2a-7=-9\]\[2a=-2\]\[a=-1\]

Answer 3

2a−7=−9
2a=−2
a=−1

Answer 4

I did this:
2a - 7 = -9 \ add 7 to both sides
2 a = -2 \ multiply by 2
What am I doing wrong??

Answer 5

you dont multiply 2 you divide by 2

Answer 6

so it is -2/2 which is -1

Answer 7

Ok, thank you. I am trying to explain to my daughter & couldn't make it work. Thank you!

Answer 8

oh ok no problem!!!