the slope of a line is -2 and the line contains the points (7,4) and (x,12). What is the value of x

the slope is the rise over the run in a line.
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1 Answer

strate line thru (7,4) with slope=-2

y=-2x+konst

projekt line from x=7 tu x=0...deltax=-7, so deltay=-2*-7=+14

y=4+14=18

line: y=-2x+18

#######...find x weer y=12

-2x+18=12

2x=18-12=6

x=3
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