#1

doing math at university.. i think its pretty basic im just a retard. question says:

If the line passing through the points (1,a) and (4,-2) is parallel to te line passing through (2,8) and (-7,a+4), what is the valu of a?

So i use M=(y2-y1)/(x2-x1)

for each line and then like substitute them becuase m is equal if they are parallel...

giving me this:

-2-a/4-1 = (a+4)-8 / -7-2

and i looked in the answers.. a=5

????? how?

thanks

If the line passing through the points (1,a) and (4,-2) is parallel to te line passing through (2,8) and (-7,a+4), what is the valu of a?

So i use M=(y2-y1)/(x2-x1)

for each line and then like substitute them becuase m is equal if they are parallel...

giving me this:

-2-a/4-1 = (a+4)-8 / -7-2

and i looked in the answers.. a=5

????? how?

thanks

#2

Math? No.

Crystal Meth? **** YEAH!

Crystal Meth? **** YEAH!

#3

lol...

#4

the answer is wrong, it should be -5

(-2-a)/3 = a-4/-9

19+9a = 3a-12

6a = -30

a = -5

(-2-a)/3 = a-4/-9

19+9a = 3a-12

6a = -30

a = -5

#5

hmmm, i got minus 5

#6

the answer is wrong, it should be -5

(-2-a)/3 = a-4/-9

19+9a = 3a-12

6a = -30

a = -5

This is what i got too.....

#7

magic where did the 8 go? you went from (a+4)-8 to a-4 ??

thanks

thanks

#8

I got -5 too

#9

magic where did the 8 go? you went from (a+4)-8 to a-4 ??

thanks

4-8=-4

#10

may i suggest to any mod veiwing this thread that the 'Only Maths Thread' get stickied?

#11

Yeah the answer is definately negative 5

#12

magic where did the 8 go? you went from (a+4)-8 to a-4 ??

thanks

order of operations, a+4 -8 is a-4, you can drop parentheses if its just addition and subtraction, nothing to distribute.

#13

magic where did the 8 go? you went from (a+4)-8 to a-4 ??

thanks

I used my uber math skillz to infer that 4-8 = -4

#14

it's mathS

.....he shoots, he scores!

.....he shoots, he scores!

#15

You're doing math in university and you can't do that? 0.o

#16

I'm pretty sure the answer is -5

#17

okay thanks everyone... we have proved... i should not be in university lol.. and that its -5