(1x+1y=8) +(3x+5y=15), Can You Solve For Y?
Answer:
3x + 5y = 15
1x + 1y = 8 (multiply by 3, and subtract from 3x + 5y = 15)
3x + 3y = 24
2y = -9 (divide both sides by 2)
y = -9/2 = -4.5
Use the second equation x + y = 8
Subtract y from both sides x = 8-y
Substitute -4.5 for y &nb
sp; x = 8 - (-4.5) = 12.5 (pos - neg = positive)
X = 12.5
Y = -4.5
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