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Margarita [4]
3 years ago
14

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

Mathematics
2 answers:
inn [45]3 years ago
3 0

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.
sweet [91]3 years ago
3 0
X = 5y + 41
x + 3y = -15

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