dang sorry looked at wrong question here is real question
what is perpendicular to -2/3x+7 and passes through (2,1)

Question

anonymous · Answer

perpendicular slopes are reciprocals with a change of sign

i.e. if the line in question is y = 2x

a perpendicular line would be y = -1/2x

then plug in the point (2,1) into the equation y = mx + b and you find b

anonymous · Answer

when i plugged it in i got 1=3 wat do i do after?

anonymous · Answer

what did you get for the perpendicular slope m?

anonymous · Answer

you have one unknown, b.

after you have figured the slope, you have x and y

so plug in to y = mx + b. solve for b.

anonymous · Answer

my slope was 3/2x

anonymous · Answer

ok thats correct.

plug in (2,1)

so you should have

$$y = mx + b$$ and if you plug in correctly it will become

$$1 = (3/2)*2 + b$$

solve for b.

then go back to $$y = mx + b$$

use that b to plug in and also the slope you just found for a general equation of the line.