X=5y+41
X+3y=-15
Substitution method
2 answers:
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.
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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