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February 8, 2016

# Homework Help: math word problem

Posted by koori on Tuesday, January 27, 2009 at 9:54pm.

can someone help me solve this? not just an answer but a method of solving cause im having a hard time grasping this.

Three times the larger of two numbers is equal to four times the smaller. The sum of the numbers is 21. Find the numbers.
• math word problem - haz, Tuesday, January 27, 2009 at 9:56pm

3xy = 4y
x+y = 21
let x equal the larger number
let y equal the smaller number
ok..
take it step by step. u first divide 4y on both sides. if that doesn't work, just plug numbers in. hope this helps! please answer my question! thanks.
XOXO
Hazel

• math word problem - PsyDAG, Wednesday, January 28, 2009 at 12:53pm

Three times the larger of two numbers is equal to four times the smaller. Let x equal the larger number, and
let y equal the smaller number.

3x = 4y or dividing both sides by 4, y = 3/4x

The sum of the numbers is 21.

x + y = 21

Substitute 3/4x for y in the second equation. and solve for x. Put that value into the first equation to find y. Check by putting both values into the second equation.

I hope this helps a little more. Thanks for asking.

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