Question

Please help with Equations from Graphs? I will fan and medal

Answer 1

what is the y-intercept?

Answer 2

i dont know

Answer 3

how to find it

Answer 4

what value on the y-axis is it when the line crosses ?

Answer 5

y intercept is -2?

Answer 6

yes

Answer 7

what is the slope (gradient) of the line?;
how many units up does the line go, when it goes across 1 unit?

Answer 8

0

Answer 9

yes!

Answer 10

The equation for a line function is
y = mx+b

you have found b=-2, and m=0

Answer 11

0x + -2

Answer 12

yes, now simplify...

Answer 13

simplify? sry im not good at math...

Answer 14

0x = 0, right?

Answer 15

what happened to the -2?

Answer 16

the -2 is all we have left

y = 0x - 2
y = 0 - 2
y = -2

Answer 17

oh okay so d

Answer 18

Yes.

Answer 19

cool. could you help with a few more? :)

Answer 20

ok

Answer 21

again we have
y = mx + b
where b is the y-intercept
and m is the slope

what is b and m in this case?

Answer 22

m= -3
b= -1

Answer 23

correct!, so what is the equation of the line?

Answer 24

is it d?

Answer 25

\[\checkmark\]

Answer 26

just a few more if you could :)

Answer 27

the slope m is equal to the rise divided run
between two points: (x_1, y_1) & (x_2, y_2)

m = ( y_2 - y_1 ) / ( x_2 - x_1 )

Answer 28

okay

Answer 29

can you find the slope between (4, 5) & (-3, -1)?

Answer 30

6/7?

Answer 31

yes!

Answer 32

what now?

Answer 33

which two options could be correct?

Answer 34

oh i see lol b and c

Answer 35

yeah, but lets check that they are equivalent,

can you rearrange B. y-5 = (6/7)(x-4)
into y= mx+b form?

Answer 36

we are hoping that the y-intercept will be the same for both B. & C.

Answer 37

im not sure

Answer 38

y-5 = (6/7)(x-4)

y = (6/7)(x-4) + 5
= (6/7)x - 4*(6/7) + 5
= (6/7)x - 4*(6/7) + 5*(7/7)
= (6/7)x + (-4*6 + 5*7) / 7
=

Answer 39

i have to go, thx for the help lol :)