SAT Math Level II Subject Test | 01

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In this video series, expert Math Tutor Dan Molloy solves full Sat Math Level II Subject Test
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Комментарии
Автор

Wouldn't point slope form be faster? Since you  have a point and a slope you just plug in the value they give you and solve right? Or does this not work every time?

passwordis
Автор

The fastest way I did it was using the slope equation, (y2-y1)/(x2-x1)=slope. So I plugged everything in and solved for y1 which was q. I did it this way in probably about 30 seconds.

Rocklegend
Автор

Honestly you can just think about it for a second and realize that if the slope is -2 is goes down -2 for every increase in X by 1 and f(1) and f(2) are just x=1 and x=2 so it is easy enough just by looking at it

StormOfTheVoid
Автор

dude you confused me at Q1 heres a better way:

f(1)= 2

f(x)=-2x+c

f(1)=-2(1)

2 = -2 + c

c = 4

f(x) = -2x + 4

therefore

f(2) = -2(2) + 4

f(2) = -4 + 4

f(2) = 0

therefore

q = 0

alrayyaniQtr