Question

How to solve this kind of equation?
y = 3x
y = -7x+2

Answer 1

its not an equation
its a system of two equations

Answer 2

You can substitute the first equation into the second equation, \[3x=-7x+2\] solve for x then plug back into the first equation to solve for y :P

Answer 3

@ganeshie8 That doesn't help anyone.

Answer 4

loll

Answer 5

how are you supposed to reorganize them to do the math

Answer 6

If you're given more than one equation, then it's a system of equations problem

Answer 7

well no, these are two seperate equations, they're just examples

Answer 8

y = 3x is not in any way connected to y = -7x2

Answer 9

er, -7x+2

Answer 10

ohk... got you, its not a system.

do you know how the graph of any of the given equations looks like ?

Answer 11

its not a question asking for a graph, its asking for a pair of numbers that work for the equation

Answer 12

ie. 2, 9, 4, 4, 5,3, etc...

Answer 13

Okay, you may do this :
1) plug any number for x in the equation
2) solve y

you get an ordered pair that is a solution of the equation

Answer 14

what is the specific formula for finding out what the pair of numbers is

Answer 15

there are no "the pair of numbers"

the solution of a linear equation, like the ones you have, is a set of infinitely many ordered pairs.
it's hard to give you a visual picture w/o refering to the graph

Answer 16

there isn't a graph. this is the exact question.

"Which ordered pair is a solution of the equation y = 3x?
-2, -9
-8, -18
-8, -3
-10, -30"

Answer 17

y = 3x

any pair of numbers that satisfy above equation is "a" solution

Answer 18

Look at the options one by one.
To test if `-2, -9` is a solution, simply plugin x = -2 and y = -9 in the equation and see if it satisfies :

y = 3x

-9 = 3(-2)

-9 = -6

which is clearly false, so -2, -9 is not a solution
check next option

Answer 19

okay nevermind, i got it. i didn't remember that the equations backwards and the first number is X and the second is Y

Answer 20

Yes, it's always (x,y) even when you read a graph look at the horizontal than vertical

Answer 21

It is a widely followed convention for an ordered pair, the first number is always the \(x\) coordinate : \((x, y)\)

Answer 22

When possible, please try to post the full question. It helps fellow helpers in understanding the actual question quick and responding accordingly...