Saturday

December 20, 2014

December 20, 2014

Posted by **Emma** on Sunday, January 6, 2013 at 9:57pm.

Can someone please check if I did this problem right? Thanks

X+y=12

X+3/2y=3/2

Y=21

x=-9

- Algebra -
**Reiny**, Sunday, January 6, 2013 at 11:11pmTo check, all you have to do is to see if your solution satisfies both equations.

Your solution satisfies the first, but not the second, so there is an erro

from the first: y = 12-x

first I would multiply the second by 2 to get rid of fractions

2x + 3y = 3

now sub in the first

2x + 3(12-x) = 3

2x + 36 - 3x = 3

-x = -33

x = 33

then y = 12-33 = -21

**x = 33 , y = -21**

check:

in first:

LS = x+y = 33-21 = 12 = RS

the 2nd:

LS = x + (3/2)y = 33 + (3/2)(-21)

= 33 - 31.5 = 1.5 = 3/2 = RS

**Answer this Question**

**Related Questions**

maths - use the substitution method to solve the linear system. 1. 3x=9 -x+2y=9 ...

algebra 1 - use the substitution method to solve the linear system. 9x+6y=3 3x-...

algebra - Requesting help. (I must reckon, that X is a variable, and y is y-...

Algebra - Use the substitution method to solve the linear system. 1/8p+3/4q=7 3/...

algebra - Use the substitution method to solve the linear system. Thanks! s= t+4...

Algebra - -3x + 2y = 8 x + 4y = -4 use substitution method to solve the linear ...

algebra - how do you use the substitution method to solve the linear system? -2x...

algebra - use method of substitution to solve the system of linear equation 3x+...

Substitution Method-Plz help - Use the Substitution method to solve the system ...

Linear Equations - Can you please help solve this equation using the ...