Question

Can someone be nice enough to help me please ?

Answer 1

need help http://openstudy.com/study#/updates/56205589e4b0cadb1e1179a0

Answer 2

consider this system of equation y=3x and 3x+y=9

Answer 3

Solving systems using substitution

Answer 4

I have to solve them using substitution and equal values method

Answer 5

i think x=3

Answer 6

@Wintersuntime. they're telling you that y = 3x right? so you plug this into the second equation 3x+y = 9 see what I did below?

y = 3x

3x+y = 9

3x+3x = 9

6x = 9

x = 9/6

Check this.

y = 3(9/6)

x = 9/6, y = 4.5

3(9/6) + 4.5 = 9
4.5 + 4.5 = 9

Answer 7

so we find that x = 1.5 and y = 4.5

you can plug both these values into the two equations and you'll find that they satisfy them both.

Answer 8

Thats substitution or equal values method ?

Answer 9

that's substitution because we substituted y = 3x into the second equation where we had y.

Answer 10

How would be in a fraction ? is it 9/6

Answer 11

Yeah that's 3/2 or 1.5

Answer 12

How do i plug them back to the equation ?

Answer 13

Let me give you a problem

Answer 14

sorry im really dumb at math

Answer 15

@wintersuntime can you solve this and show me what you get step by step?

y = 2x

2x+y = 16

Answer 16

add 2x both sides first