Question

Find the x-intercept and y-intercept.
2x+y=7

Answer 1

hey.. replace x by 0 to get y intercept
replace y by 0 to get x intercept

Answer 2

for example replacing x by 0 gives:

2*0+y = 7
y =7
it's the y intercept

Answer 3

I know that,But I'm confused after that. It's like 2(0)+y=7 Right? But I don't know what to do after that...

Answer 4

Oh..Okay..I get it..I think..

Answer 5

But what about the x? Is it 2x+0=7?

Answer 6

yes

Answer 7

2x=7
what is x then ?

Answer 8

5? If I'm supposed to subtract 2 from both sides...

Answer 9

I hate Pre-Algebra>.<

Answer 10

no divide both sides by 2

x = 7/2
x=3.5

Answer 11

How do you know when to divide or subtract?..

Answer 12

2x = 7
it means
2*x = 7

so you must divide in order to get rid of the multiplication

but when there is addition you have to subtract

Answer 13

Oh..Okay..

Answer 14

2+x=7
here you have to subtract 2 from both sides

Answer 15

And then if there's subtraction you add right?

Answer 16

yes!
x-2=7
add 2 to both sides

Answer 17

if there is a division you have to multiply
x/2 = 7

multiply by 2

Answer 18

I get it..I have another thing..It says Write this equation in slope-intercept form, and then find the slope and y-intercept.
-y=3x So what do I do? I mean,I know the answer is -3,) But I don't know how to find it.

Answer 19

divide both sides by -1
and get
y = -3x
in such equations (y=ax+b) a means slope and b means y intercept

Answer 20

So where does the -1 come from?