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