SOLUTION: 4x + y = 15 2x + 5y = 21

Question 476435: 4x + y = 15
2x + 5y = 21

Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
4 x + 1 y = 15 .............1
2 x + 5 y = 21 .............2
Eliminate y
multiply (1)by -5
Multiply (2) by 1
-20 x -5 y = -75
2 x + 5 y = 21
Add the two equations
-18 x = -54
/ -18
x = 3
plug value of x in (1)
4 x + 1 y = 15
12 + 1 y = 15
1 y = 15 -12
1 y = 3
y = 3

RELATED QUESTIONS
1. 4x+3y=1, x=1-y 2. 2x-y=6, -x+y=-1 3. 6x-y=3, 4x-2y=-2 4. 2x+3y=7, x=1-4y 5.... (answered by AnlytcPhil)

4x + 5y = 51 4x - 5y =... (answered by Fombitz)

rewrite the following equations in y=form 4x + 2y = 12 5y = 2x +... (answered by Fombitz)

Solve -3x+5y=21 and... (answered by MathLover1,josgarithmetic)

2x + 5y =-6 4x +y... (answered by stanbon)

4x-5y=-23 y+2x... (answered by algebrahouse.com)

I need help immediately :( I don't understand these equations , I was absent. I'm... (answered by jim_thompson5910)

1) x+y=9 x+2y=13 x= y= 2) 3x+7y= 24 9x+5y=24 x= y= 3) 4x+y=17 2x+3y+21 x= (answered by Fombitz)