Help me with this please

Use the knowledge of x- and y- intercepts to choose the correct graph of the equation 3x+6y=6

What is the value of m in the equation 1/2 m - 3/4n=16 when n=8

Robin spent 25% more time on his research project than he had planned he’s been an extra h ours on the project which of the following expressions could represent the number of hours rob actually spent on the project