Y is partly constant and partly varies as x...if y=2 x=4 and when y=5 x=8....find y when x=9
y = kx+c
so, now you know that
2 = 4k+c
5 = 8x+c
Find k and c, and then you can find y when x=9
so, now you know that
2 = 4k+c
5 = 8x+c
Find k and c, and then you can find y when x=9