(Sorry forgot to put picture)
2 answers:
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Answer:
see below
Step-by-step explanation:
The point-slope form of the equation of a line is ...
y -h = m(x -k)
for a line with slope m through point (h, k).
Comparing this to the given equation, you see that ...
h = -2, m = 1, k = -4
The line has a slope of 1 and goes through the point (-4, -2). This information is useful for graphing.
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You can also rearrange the equation to slope-intercept form by subtracting 2 from both sides.
y = x +2
This has a slope of 1 and crosses the y-axis at y=2. It graphs the same as the above.
Answer:
Yes, y varies directly with x, and the equation is .
Step-by-step explanation:
To check where there is a direct relationship between x and y, we need to check whether all the x,y pairs we have fit some rule:
.
For the first pair (x=4, y=6.4),
Therefore .
For the second pair (x=7, y=11.2),
Therefore .
For the third pair (x=10, y=16),
Therefore .
For the second pair (x=13, y=20.8),
Therefore .
So x does directly vary with y, and we have found out that .