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# can some one teach me simultaneous equations? watch

1. wjen you get a simultaneous equation like:
x^2 + y^2 = 29
x - y = 4
how would you work it out it was one of the exam question in the November 2003 maths exams i need a genius or some one who know it to help my

V
BTW if you do decide to help me tehn could you please make it as simple as possible :P thanks again
2. (Original post by vmong)
wjen you get a simultaneous equation like:
x^2 + y^2 = 29
x - y = 4
how would you work it out it was one of the exam question in the November 2003 maths exams i need a genius or some one who know it to help my

V
BTW if you do decide to help me tehn could you please make it as simple as possible :P thanks again
Take the second equation and make either x or y the subject:

x = y + 4

Now substitute this into the first equation:

(y + 4)^2 + y^2 = 29

Expand the bracket:

y^2 + 8y + 16 + y^2 = 29

2y^2 + 8y - 13 = 0

Solve that quadratic to get values for y, then substitute each of these into x - 4 = 4 to get the x values.

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