the total number of calories Erin would burn, c is given by the equation below. c=9x+7(60-x) if erin's goal is to burn 468 calories, what is the minimum number of minutes she needs to jog?

Question

johnweldon1993 · Answer

I'll assume "x" is the number of minutes, and c is the number of calories
so

c=9x+7(60-x)
** we have the number of calories we want so

468=9x+7(60-x)

now we solve for x...first distribute the 7 into the parenthesis

468=9x+420-7x

combine like terms...****9x - 7x = 2x

so

468 = 2x + 420
-420        -420

48 = 2x
--------
 2      2

x = 24

so she would need to jog 24 minutes to burn that many calories

lovetostudy · Answer

THANK YOU SOO MUCH! THIS MAKES MUCH MORE SENSE NOW.

johnweldon1993 · Answer

anytime :)