Can some help me to find X and Y in a linear equation?

Question

Can you help me find x and y and tell me each step for this linear equation please if:
(If you wondering that fraction is negative one-third
Y= -⅓x + 7
Y= 3x - 4
Please tell me the steps it takes. Thank you. ^_^

Answer 1

Y = -1/2 X +7 ...............1

Y = 3X -4 ................2



so,

3X - 4 = -1/2 X +7

or

3X + 1/2X = 7 + 4

or

7X/2 = 11

or X = 22/7 or X =pie





Happy working



Brajendra

Answer 2

if you have a graphics calculator, use your simultaneous equations tool. On a Casio this is under EQUA in the main menu, and , then siml under the new menu. Using two unknowns, put the values into the table and press solve.

If you have a HP, use your SIM Equation under APLET, put in the equations, press NUM.



This should give you your answer =]



otherwise, you can work it out like so :

y=-1/3x+7 and y=3x-4



therefore if y=3x-4 then 3x-4=y

therefore 3x=y+4 (four to the other side of =)

therefore x=1/3y+4/3 (if you divide x by three, must divide all by three)



so now, if x=1/3y+4/3,

then y=-1/3x+7 is now..

y= -1/3 (1/3y+4/3) +7



If you use your calculator or algebra to then solve for Y, you have your answer, which is 5.9





well at least i think thats right lol.

hope i cud help.

Answer 3

Well, i've been studying these for my upcoming maths exam, and i think they're called "simultaneous equations" too.

Well there's two ways to do this, either by the "elimination method or "substitution method" i'll do elimination.



Y= -⅓x + 7 (1)

Y= 3x - 4 (2)



So first multiply (1) by 9

So 9Y = -3X + 63 (also equals (1))

Then you can plus (1) & (2) together, so you basically plus the pronumerals and numbers together.

So: 9Y = -3X + 63 +

Y = 3X -4

10Y = 59 (-3X + 3X = 0, 63 + -4 = 59)

Then divide both sides by 10 to make Y by itself, Y = 5.9

Then you substitute Y back into the original equation to find X

Y(5.9)= 3x - 4 (2)

5.9 = 3x - 4

Then plus 4 on both sides to put the numbers and pronumerals on different sides 9.9 = 3X

Then divide both sides by 3. X= 3.3

Therefore X=3.3, Y = 5.9

hope i helped :)

Answer 4

OMG, im in 8th grade and where doing these



i think its



y= -1/3x +7

-7 -7

________

y-7 = -1/3x



and



Y=3x-4

+4 +4

_______

Y+4 = 3x



i think its cause when you have two variables like that, you just write it out like 4+y, thats how i would do the problem, but if you want, dont trust me, because, i failed all my math tests so far

Answer 5

look 3y = -x +21and 3y= 9x - 12 so when we equate right hand sides *** the left hand sides are equal then -x+21=9x-12 so transferring the x terms on one side and non x terms on one we get 9x+x=21-12so x=9/10 so putting this in the first equation we get y=-9/30+7 so y= -9+210/30 so y= 201/30