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erastovalidia [21]
3 years ago
10

6) three times a number increased by four is less than -62

Mathematics
1 answer:
Irina-Kira [14]3 years ago
6 0
6) 3x + 4 < - 62         x = - 23 ⇒ 3(-23) + 4 < - 62
   <u>      - 4     - 4 </u>                              -69 + 4  < - 62
    3x       < -66                                     - 65 < - 62
   <u>÷ 3          ÷3</u>
      x       < -22

7) x/-5 + 1 <u><</u> 7            x = -30 ⇒ -30/-5 + 1 <u><</u> 7
    <u>       - 1    -1</u>                                  6 + 1  <u><</u> 7
    x/-5       <u><</u> 6                                         7 <u><</u> 7
   <u> × -5         × -5</u>
    x           <u><</u> -30

8) x/3 - 2 <u>></u> -12         x = -30 ⇒ -30/3 - 2 <u>></u> -12
    x/3      <u>></u> -10                           -10 - 2  <u>></u> -12
    <u>* 3           *3</u>                                 -12  <u>></u> -12
     x        <u></u><u>></u> -30

9) -2x - 6 > -18                 x = 5 ⇒ -2(5) - 6 > -18
    <u>      +6     +6</u>                               -10 - 6 > -18
    -2x      > -12                                    -16 > -18
    <u>÷ -2         ÷ -2</u>
       x      > 6   ⇒ x < 6
*flip the inequality sign because the divisor is a negative number: This is to make the inequality true.
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