math help & correction
posted by jacky .
Problem #1
Is this correct or wrong?
Find the slope of the line passing through the points(1, 1)and(1, 2). Write the equation of the line.
For this one I KEEP GETTING
Y=  (3)/(2)x2.5
Problem #2
Find the yintecept and slope of
7x+9y=72
My answer:
Slope is:  (9)/(8)
yintercept: (0,8)
The equation of a straight line is given by
(y2y1)/(X2x1)
In your example
Y2=2, y1=1
x2=1, x1=1
substitute and find the slope
In the second part the general equation of a straight line is given by
y=mx+c where m=slope and c=intercept.
you need to compare the equation given with the general equation, but to do that they need to be in the same form
i.e y=mx+c
but 7x+9y=72 is not in this form
To get you started subtract 7x from each side:
9y=727x
but this is still not in the correct form so you still need to rearrange it.
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