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anonymous
 one year ago
need help with 7x<28 solve graph
anonymous
 one year ago
need help with 7x<28 solve graph

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phi
 one year ago
Best ResponseYou've already chosen the best response.0this is tricky. because you have a < sign, we have to be careful if we multiply or divide by negative numbers. here, divide both sides by 7 and *switch the sign* to > you get x> 4

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0it is tricky. I have a number line to put the answer on. also why did you make x>than 4

phi
 one year ago
Best ResponseYou've already chosen the best response.0here is an example with numbers 7 < 4 that says minus 7 is smaller than minus 4 (and it is) if we multiply (or divide by a negative number) , the sign must change. for example, say we multiply by 1 (on both sides), like this 1*7 < 1*4 7 < 4 and that is not true. but 7>4 is true.

phi
 one year ago
Best ResponseYou've already chosen the best response.0one way to stay out of trouble is only multiply by positive numbers. and use add/subtract for example 7x< 28 add 7x to both sides 7x+7x < 28 + 7x 0 < 28 + 7x now add 28 to both sides. we get 28 < 7x finally , divide both sides by 7 28/7 < x 4 < x

phi
 one year ago
Best ResponseYou've already chosen the best response.04 < x the "big side of <" is next to x and the small end of < is next to 4 that means this says 4 is smaller than x or x is bigger than 4 we can also write it x> 4 which also means x is bigger than 4

phi
 one year ago
Best ResponseYou've already chosen the best response.0to graph it, make a number line. put an open circle O at 4 (if it were \( x \ge 4\) we would use a filled in circle) then show all the numbers bigger than 4 by drawing a line with an arrow head pointing toward the bigger numbers i..e toward 0
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