Question

What is the equation in standard form of the line which passes through (1, –3) and has a slope of 2?

2x – y = 5

2x – y = –5

2x + y = 5

2x + y = –5

Answer 1

which one you think is correct

Answer 2

i don't know yet.

Answer 3

use formula y=mx + b, to find value of b

so you have points (x,y) -> (1,-3) insert in formula and m= slope = 2

-3 = (2)(1) + b

so what is the value of b ??

Answer 4

i don't know how to find that out.

Answer 5

someone please help.

Answer 6

well you have -3 = 2 +b
-2 -2
=================
-5 = b

so you have b = -5

Answer 7

so it's either B or D

Answer 8

now you know that the equation is y = 2x -5

Answer 9

is it B?

Answer 10

no, because let see B how would look like when I transfer
you need to isolate y

B) 2x -y = -5
-y = -2x - 5
---- --- ---
-1 -1 -1

y = 2x +5 not good

Answer 11

ohh so it's D?

Answer 12

Lets try D) 2x + y = -5
y = -2x -5 not good because the slope shows -2

Answer 13

what the..... okay A?

Answer 14

Ok wait,
The equation of line in slope point form is given as;
\[y-y _{1}=m(x-x _{1})\]
\[y-(-3)=2(x-1) \rightarrow y+3=2x-2 \rightarrow y=2x-2 -3 \rightarrow y=2x-5\]
I.e. 2x-y=5 is the required eq of the line

Answer 15

yayyy it's A

Answer 16

ok, let try A

A) 2x -y = 5

-y = -2x +5
---- --- ---
-1 -1 -1

y = 2x - 5 GOOD