Question 103718
The sum of Two numbers is 39.Twice the first number and plus 3 times the second 

number is 101.What are the numbers?

Solution

let the two numbers be x and y

x+y=39.......equation 1

2x+3y=101....equation 2


get the value of y from the equation one....

y=-x+39   then substitute y to equation two...

2x+3(-x+39)=101

2x-3x+117=101....group like terms

2x-3x=101-117

-x=-16

x=16

substitute the value of x to first equation

x+y=39

16+y=39

y=39-16

y=23



Checking....

2x+3y=101

2(16)+3(23)=101

32+69=101

101=101


it's easy...
(madali lang ito)

From matthew..huhuhu