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maylindominguez
03.02.2020 •
Mathematics
Is (2,-3) a solution for the linear equation y = 4x - 5? justify your answer
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Ответ:
Here is why:
The ordered pair (2,-3) means x = 2 and y = -3 pair up together
Let's plug these x and y values into the equation to get...
y = 4x - 5
-3 = 4*2 - 5 replace with 2, replace y with -3
-3 = 8 - 5
-3 = 3 we end up with a false equation
Since we get a false equation at the end, this means the original equation is false too. So y = 4x-5 is false when (x,y) = (2,-3) meaning that this point is not on the line. So this point is not a solution.
Ответ:
(2,-3) is not a solution to the equation
Step-by-step explanation:
To determine if a point is a solution to the equation, we substitute the point into the equation. If it is true, then it is a solution, if it is false, then it is not.
y = 4x -5
-3 = 4(2) -5
-3 = 8-5
-3 = 3
This is false , so (2,-3) is not a solution to the equation
Ответ:
Step-by-step explanation:
12 days × 8 hours/day = 96 hours
15 workers × 96 hours = 1,440 worker-hours
16 days × 9 hours/day = 144 hours
10 workers can finish the job in 16 days, working 9 hours a day.