The value that makes this true is a
144 is the answer
7^2 = 144
144/9 = 16 therefore a multiple of 9
Standard form: Ax + By = C
First make slope intercept
y = 1/3(x - 6) + 9
y = 1/3x - 2 + 9
y = 1/3x + 7
Now make standard form
Subtract 7 and y
1/3x - y = -7
Get rid of fraction
Multiply all by 3
Solution: x - 3y = -21
I don't think you can as long as your not plus.
Multiply 29.5 by 2 and you will get 59