If 3a +5b =10 and 5a +3b =30 what is the average of a and b?

If y varies directly as x2 and y=6 when x=6, find the constant of variation.

Use multiples to write two fractions equivalent to 7/9. 14/18, 8/10 6/8, 21/27 10/12, 28/36 14/18, 21/27

Ireally need subtract and simplify.(-y^2 – 4y - 8) – (-4y^2 – 6y + 3)show your work, ! i will mark you brainliest but you have to show your work.