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Normal means perpendicular
so if the 2 lines ar perpendicular then the slopes multiply to get -1

that means the derivitives multiply to get -1

let's call the first one f(x) and 2nd g(x)

f(x)=x²-7x
g(x)=-x+13

take derivitive of each
f'(x)=2x-7
g'(x)=-1
so when do they multiply to get -1

(2x-7)(-1)=-1
-2x+7=-1
minus 7 from both sides-2x=-8divide both sides by -2x=4
at x=4

so find the slope of f(x) then find the line perpendicular to it at x=3
f'(4)=2(4)-7=8-7=1
the slope is 1
the normal line will have a slope of -1 because 1 times -1=-1
find f(4)
f(4)=4^2-7(4)=16-28=-12

slope is -1 and a point is (4,-12)
y=-1x+b
-12=-1(4)+b
-12=-4+b
-8=b

y=x-8 is the equation

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.