# solve the simultaneous equation y=3x+5, y=4x^2+x

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3x + 5 = 4x² + x

4x²-2x-5=0

x=1.4, -0.9

when x=1.4 y=3(1.4)+5=9.2

when x=-0.9 y=3(0.9)+5=7.7

x = 1.4, y = 9.2

x = -0.9, y = 7.7

i got it wrong

4x²-2x-5=0

x=1.4, -0.9

when x=1.4 y=3(1.4)+5=9.2

when x=-0.9 y=3(0.9)+5=7.7

x = 1.4, y = 9.2

x = -0.9, y = 7.7

i got it wrong

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#2

(Original post by

3x + 5 = 4x² + x

4x²-2x-5=0

x=1.4, -0.9

when x=1.4 y=3(1.4)+5=9.2

when x=-0.9 y=3(0.9)+5=7.7

x = 1.4, y = 9.2

x = -0.9, y = 7.7

i got it wrong

**iizhaque**)3x + 5 = 4x² + x

4x²-2x-5=0

x=1.4, -0.9

when x=1.4 y=3(1.4)+5=9.2

when x=-0.9 y=3(0.9)+5=7.7

x = 1.4, y = 9.2

x = -0.9, y = 7.7

i got it wrong

3*(-0.9) + 5 is not 7.7

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#6

(Original post by

its still wrong for some reason

**iizhaque**)its still wrong for some reason

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#7

**iizhaque**)

3x + 5 = 4x² + x

4x²-2x-5=0

x=1.4, -0.9

when x=1.4 y=3(1.4)+5=9.2

when x=-0.9 y=3(0.9)+5=7.7

x = 1.4, y = 9.2

x = -0.9, y = 7.7

i got it wrong

What's the actual answer?

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Attachment 892214

3x+5=4x²+x

4x²-2x-5=0

x=1.4, -0.9

y=3(1.4)+5=9.2

y=3(-0.9)+5=2.3

x = 1.4, y = 9.2

x = -0.9, y = 2.3

and its still wrong

3x+5=4x²+x

4x²-2x-5=0

x=1.4, -0.9

y=3(1.4)+5=9.2

y=3(-0.9)+5=2.3

x = 1.4, y = 9.2

x = -0.9, y = 2.3

and its still wrong

Last edited by iizhaque; 1 year ago

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#11

(Original post by

**iizhaque**)
Last edited by chibichibi_xx; 1 year ago

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(Original post by

The answers given there are just an example of how you should write them, they're not the actual answers. Used Wolfram Alpha and got x=-0.9,y=2.3 , x=1.4,y=9.2

**chibichibi_xx**)The answers given there are just an example of how you should write them, they're not the actual answers. Used Wolfram Alpha and got x=-0.9,y=2.3 , x=1.4,y=9.2

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#13

(Original post by

i did not use the examples

**iizhaque**)i did not use the examples

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#14

(Original post by

Maybe it's just the way you've inputted the answers as they are right - maybe you're not supposed to show working and just write the answers? I have no idea how it's still wrong.

**chibichibi_xx**)Maybe it's just the way you've inputted the answers as they are right - maybe you're not supposed to show working and just write the answers? I have no idea how it's still wrong.

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(Original post by

yeah that would be my suggestion, it may just want the answers

**laurawatt**)yeah that would be my suggestion, it may just want the answers

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#16

If you do not do any rounding to 2dp until the end, the y values are 9.19 and 2,31. Does that work?

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#17

(Original post by

If you do not do any rounding to 2dp until the end, the y values are 9.19 and 2,31. Does that work?

**Matureb**)If you do not do any rounding to 2dp until the end, the y values are 9.19 and 2,31. Does that work?

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#18

is says to 2 decimal places all of yours are to 1

Last edited by A_C_H; 1 year ago

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#19

It should be to 2 decimal placesThe answer is: x=1.40, y=9.19x= -0.90, y= 2.31(got me 5/5)

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