The differential equation y-4y (y7 5x) can be written in differential form: m(x, y) dx n(x, y) dy 0 where , and n(x, y) м'х, у) — the term m(x, y) dx + n(x, y) dy becomes an exact differential if the left hand side above is divided by y . integrating that new equation, =c the solution of the differential equation is

because linear equations are a lot simpler than quadratics equations, and linear equations formula is a lot easier to memorize. that's why i think they're harder.

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional