Equation is in a picture this is for middle school 8th grade

the first equation, y = 9/4 x

Step-by-step explanation:

according to the equation for slope-intercept form y=mx+b, the m represents the slope indicating that the 9/4 would be placed there with the exponent of x attached to it. And the y-intercept is represented by the b in the equation, and since it is 0 in this case you will not need to add it in the equation. so your final answer would be y=9/4x

(n^3 - n)

= n(n-1)(n+1)

since it is divisible by 3 and 2 ,because it is a multiple 3 consecutive number

if, n-1 is odd then n+1 is also odd, then it is a multiple of 9

but if, n-1 is even then n+1 is also even, then it is a multiple of 4

so, largest multiple = max(9*2, 4*3) = max(18, 12) = 18