Question

4. Using the substitution meth
following pairs of simultaneous equation
(a) x + y = 7/x-y=5

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Answer 1

Explicação passo-a-passo:

x + y = 7 ( 1.)

x - y = 5 (2.)

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x = 7 - y substituir

7- y - y = 5

7 -2y = 5

- 2y = 5 -7

-2y = -2 multp (-1)

y = 2/2 = 1

x + y = 7 ( 1.)

x + 1 = 7

x = 7 -1

x = 6