MONDAY MATH MADNESS; 2/11/19

Published Monday, February 11, 2019 by Tifinie

Regular practice will keep your math skills always at their best.  Continue to keep your math skills strong by practicing this week’s brain buster from Geometry!

 

An isosceles triangle has a base of 1-1/3 feet and an area of 48in2, what is the perimeter measured in inches?

 

A) 160

B) 36

C) 48

D) 100

E) None of the above

 

Stay tuned next week for the solution and a new question!

 

 

Solution for last week’s Math Madness question:

 

x + 8y = 10         4x + 8 = 4(y+3)                   FIRST, SOLVE FOR  “x”  OR  “y” (I CHOSE TO SOLVE FOR “x”)

-8y         -8y

x = 10 – 8y

4(10-8y) + 8 = 4(y+3)         THEN SUBSTITUTE WHATEVER YOU SOLVED FOR INTO THE OTHER EQUATION

40 – 32y + 8 = 4y + 12       AND SIMPLIFY :  SOLVE FOR THE REMAINING “x” OR “y”   (I WOULD NOW SOLVE FOR “y”)

+32y          +32y

40 + 8 = 36y + 12

48 = 36y + 12

-12           -12

36 = 36y

/36     /36

1 = y

SOLVE FOR THE REMAINING “x” OR “y”

x = 10 – 8y                                                    GO BACK TO FIRST EQUATION

x = 10 – 8(1)                                                  SUBSTITUTE AND SIMPLIFY

x = 10 – 8

x = 2

 

x = 2; y = 1

 

BACK TO THE ORIGINAL QUESTION:

what is xy?         SUBSTITUTE

(2)(1)                   MULTIPLY

2                          THE PRODUCT


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