1.

If -5c-7 le 8, what is the least possible value of 15c+7 ?

Answer»

`-38`
`-4`
15
22

Solution :Don'tsolve for c on autopilot. Instead, solve for 15c, then add 7 to both sides. To do this, first muiltiply both sides of the inequality by `-1` to GET` 5c + 7 GE -8.` (Notice that the inequality sign had to be flipped due to multiplication by a negative number. ) Then subtract 7 from both sides to yield `5c ge -15.` Multiply both sides by `3:15c ge -45.` Finally, add 7 to both sides: `15c +7 ge -38.` Choice (A) is correct.


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