kstone51200 kstone51200

21-04-2015
Mathematics

contestada

X=5y+41
X+3y=-15
Substitution method

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EveningStar EveningStar

21-04-2015

you substitute 5y+41 for x and get 5y+41+3y=-15 then you simplify by doing 8y+41=-51 subtract 41 from each side and divide by 8 to get y alone. That's how you get 11.5 for your answer.

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Panoyin Panoyin

22-04-2015

x = 5y + 41
x + 3y = -15

(5y + 41) + 3y = -15
(5y + 3y) + 41 = -15
      8y + 41 = -15
      - 41   - 41
      8y = -56
   8    8
      y = -7
x = 5(-7) + 41
x = -35 + 41
x = 6
(x, y) = (6, -7)

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