SOLUTION: solve and graph the solution: 57 -4t is greater than or equal to 13

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Question 93532: solve and graph the solution:
57 -4t is greater than or equal to 13

Answer by jim_thompson5910(35256)   (Show Source): You can put this solution on YOUR website!


Subtract 57 from both sides


Combine like terms on the right side


Divide both sides by -4 to isolate t (note: multiplying/dividing a negative number on both sides flips the sign of the inequality)



Reduce

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Answer:
So our answer is




Now let's graph



Set up a number line:
note: just replace the x with the variable you are working with


Now plot the point t=11 on the number line





Now pick any test point you want, I'm going to choose t=0, and test the inequality


Plug in


Since this inequality is true, we simply shade the entire portion in which contains the point t=0 using the point t=11 as the boundary.This means we shade everything to the left of the point t=11 like this:
Graph of with the shaded region in blue
note: at the point t=11, there is an closed circle. This means the point t=11 is included from the solution set.

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