Question

Substitute

y= 2x+4 3x+4y=5

Answer 1

y= 2x+4
3x+4y=5

Answer 2

just replace y with 2x+4 everywhere you see it

3x + 4(2x+4) = 5

what is 4(2x+4)?

Answer 3

want me to substitute 4(2x+4)?

Answer 4

solve

Answer 5

distribute the 4 and expand it

Answer 6

9x+16

Answer 7

8* not 9

Answer 8

i need to get X and Y

Answer 9

8x+16* yeah

So now we have
3x + 8x+16 = 5

Combine like terms.
11x + 16 = 5

now what?

Answer 10

x=-1

Answer 11

yeah and to find y replace -1 into y= 2x+4

Answer 12

so y=2(-1)x+4?

Answer 13

basically
and 2*(-1)+4 = -2 + 4 = 2

Answer 14

y=4−2x

Answer 15

the whole point is x = -1. You basically have y.

y=2(-1)+4? NO X'S HERE
y = -2 + 4 = 2

Answer 16

Thanks

Answer 17

@soisoi

Answer 18

can you help me with another one?

Answer 19

possibly? post it in another question