Insert (1,1) -> x=1, y=1 into the equation and check if both side are equal:
y=3x-2
1=3*1-2
1=1
so yes the ordered pair is a solution of the equation
A number divided by 7 is 9:

Multiply both sides by 7 to get the answer so it'll be:
x = 63
You need to keep -3x/5, change the division sign to multiplication and flip 4/5 so it becomes 5/4. When you did that, -3x/5 times 5/4 is equal to -15x/20. Lastly, you simplify it so the answer is -3x/4
The answer is 5 because 10 divided by 2 is 5