This simultaneous equation is stressing me out, anyone can help what I am doing wrong?!

2x + y = 19
7x + y = 29

Multiplied the 2 x7 and the 7 X2
14x + 14y = 133
14x + 2y = 58

Then take it away:
12y = 75
y = 75/12 = 6.25

Then find the X
2x + 6.25 = 19
2x = 12.75 / 2 = 6.375

When I try to work out the 2 x 6.375 + 6.25 = 19 is fine
but then 7 x 6.375 + 6.25 doesn't give me 29!!! GRR

Question

This simultaneous equation is stressing me out, anyone can help what I am doing wrong?!

2x + y = 19
7x + y = 29

Multiplied the 2 x7 and the 7 X2
14x + 14y = 133
14x + 2y = 58

Then take it away:
12y = 75
y = 75/12 = 6.25

Then find the X
2x + 6.25 = 19 
2x = 12.75 / 2 = 6.375

When I try to work out the 2 x 6.375 + 6.25 = 19 is fine
but then 7 x 6.375 + 6.25 doesn't give me 29!!! GRR

anonymous · Answer

Where you have mulltiplied the first equation by 7, you should actually have
14x+7y=133

anonymous · Answer

2x + y = 19
7x + y = 29
14x + 7y = 133

anonymous · Answer

yep safiah

anonymous · Answer

@Safia what a silly mistake, I am tired I should leave Maths for a while. Silly mistake thanks for noticing!

anonymous · Answer

no problem.Here to help :-)

anonymous · Answer

serrico - i know what u mean - i just made a mistake in my last reply - i'm too tired to carry on !!