Determine the value of y when x=15 if y=6 when x=30

Evaluate the expression for the given value of the variable. 5×(h+3) for h=7

How to do this , and can some one explain

(03.03 mc) choose the graph below that correctly represents the equation 2x + 4y = 24. (5 points) select one: a. line through the points 0 comma 6 and 12 comma 0 b. line through the points 0 comma negative 6 and 12 comma 0 c. line through the points 0 comma negative 12 and 6 comma 0 d. line through the points 0 comma 12 and 6 comma 0