1. If y varies directly as x and y=13 when x=23.4, find y when x=9.
1 answer:
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1: Assuming this line is linear, the first thing to do is find the slope.
The slope formula is
, so in this case, it is 
, which comes to 
. Then, use your slope and one of the points given to write the point-slope formula of the linear equation, and then written in standard form:
y=x-
.
2. Use the same process as in question 1 to find:
y=-7x+11
The slope formula is
y=
2. Use the same process as in question 1 to find:
y=-7x+11