http://prntscr.com/ktn5p2
@Vocaloid
Correct?
hm not quite you should be looking for something like y = kx where nothing is being added or subtracted from x or y by itself
however, I will say this one is tricky because if (x+____) is in brackets and multiplied to a constant, then that would also be direct variation
So B?
yeah B would be the better choice
if 400 text costs $8 you can divide 400/8 to get the text per dollar rate then multiply by 10 since you have 10 dollars
500
A
good
so you set up a proportion where before-tax price / tax = before-tax price/tax they already give you a 400 dollar comp w/ 30 dollar tax, so 400/30 = before-tax price/tax then we plug in the 500 dollar computer we want the tax for so 400/30 = 500/x
A
but its y instead of x
oh I didn't catch that, well done
try to find the one that looks the most like y = mx + b
b
good
as a hint we can subtract x from both sides to get y = -x + 2 using the formula y = mx + b, b is the y-intercept, so what would be the y-interecept for y = -x + 2?
A or B
im thinking A what do u think
ah anyway, since x + y = 2 we can plug in y = 0 to get the x-intercept so x + 0 = 2 so yeah A is correct
anyway I actually gotta get to class see you later ;_;
Oh okay lol. had one more question but its okay ty
@kittybasil
\[y-2=-1(x+2)\]Isolate the \(y\)\[y=-1(x+2)+2\]Simplify the right side\[y=-x-2+2\]\[\therefore y=-x\] Since your \(x\) is negative, it means \((-1)x\) so your slope is \(-1\)
Checking the last two choices, \(x=2\) then \(y=-(2)=-2\) so the first "point" option is wrong. \(x=-2\) then \(y=-(-2)=2\) which is correct So you pick options 2 and 4
@dude
Make a new post, this is getting long
Any idea though?
D?
Not quite \(y=mx+b\) b is the y-intercept \(\mathbb {if~3~is~negative..}\)
C
Yes
i will make a new post
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