What is the y-coordinate of the solution of the system?
{3x+10y=7, x-10y=29}
1 answer:
We know that: 3x + 10y = 7 We also know that: x - 10y = 29 Which means that: x = 29 + 10y If, x = 29 + 10y, 3(29 + 10y) + 10y = 7 3*29 + 30y + 10y = 7 3(20+9) + 40y = 7 60 + 27 + 40y = 7 87 + 40y = 7 40y = 7 - 87 40y= -80 y=(-80)/40 y=-2Answer y=-2. If y=-2, x-10(-2)=29 x+20=29 x=29-20x=9 Let's see if these results are true: 3(9)+10(-2)=7 27-20=7 (Correct) ----------- 9-10(-2)=29 9+20=29 (Correct) Answer once again:y=-2
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590,551.2
1km ⇦.0003048ft
1hr⇦60min
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