Question

Find an equation of the line that passes through the points (1,2) and (2,3).
A) y = x - 1
B) y = x + 1
C) y = x - 2
D) y = 2x - 1
@pooja195 i dont know how to start on this one

Answer 1

Start by finding the slope
Use the slope formula
\[ \huge~\rm~\bf\color{blue}{ \frac{y_2-y_1}{x_2-x_1}=slope} \]

Answer 2

1/-1

Answer 3

\[\huge~\rm~\bf\color{blue}{ \frac{3-2}{2-1}=slope}\]

Answer 4

do i insert the slope into y=mx+b

Answer 5

you have the incorrect slope.
3-2=?
2-1=?

Answer 6

3-2=1 and 2-1= -1

Answer 7

2-1 does not equal -1

Answer 8

1 sorry

Answer 9

Good
1/1=1
soo...
our slope is just x
y=mx+b
m=1
now we have:
y=1x+b
To find the b we need to plug in one of the points lets do (1,2)
y=1x+b
Plug in your coordinates
x=1
y=2
Plug in:
2=1(1)+b
solve for b

Answer 10

umm b=1?

Answer 11

Perfect! :)
y=1x+b
now plug in the 1 in place of b what's our answer? (final answeR)

Answer 12

so that answe would be B

Answer 13

Good job :-)

Answer 14

thanks:)

Answer 15

yw ^_^