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Sshadøw
29.01.2022 •
Mathematics
the quadratic curve crosses the x axis at 3,0 and the y intercept is 9. express this in the equation y = ax2 + bx + c
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Ответ:
Step-by-step explanation:
Let x=hrs for the older pump to drain the pool
y=hrs for the newer pump to drain the pool
We have 2 unknowns, so we need 2 equations to solve this problem:
x=3y
x+y=9
Using the substitution method, replace "x" with 3y in the 2nd equation and solve for "y":
x+y=9
3y+y=9
4y=9
y=9/4
Using this value for "y", solve for "x" in the first equation:
x=3y
x=3(9/4) :3
x=27/4
Check:
x=3y x+y=9
27/4=3(9/4) 27/4+9/4=9
27/4=27/4 check 36/4=9
9=9 check
Therefore, the number of hours for the older pump to drain the pool, "x", 27/4=6.75hrs.
:3