Solve this system of equations using substitution. Put your answer in ordered pair form, (x, y).
x + y = 15
4x + 3y = 38

Question

Solve this system of equations using substitution. Put your answer in ordered pair form, (x, y).
  x + y = 15
4x + 3y = 38

anonymous · Answer

3*(1) - (2)
3x+3y=45

=> 3x-4x +3y-3y=45-38
-x=7
x=-7

-7+y=15
y=22

anonymous · Answer

x=15-y
4(15-y)+3y=38
6-4y+3y=38
-y=38-60
y=22

22+x=15
x+15-22
x=-7
(-7,22)

anonymous · Answer

Take the bottom from 4* the top -> y=22 and sub back for x.

anonymous · Answer

y = 15 - x
plug this into second equn.

4x + 45- 3x = 38
x = -7
y = 15 - - 7 = 22

answer   x,y = -7,22

anonymous · Answer

-7,22 thats wrong

anonymous · Answer

(-7,22) better in brackets?

anonymous · Answer

-7,22 thats wrong

-7 + 22 = 15 => correct!
4*(-7) + 3*22 = -28 + 66 = 38 => correct!

llort · Answer

(-7, 22)

anonymous · Answer

x+y=15
4x+3y=38


4x+4y=60
4x+3y=38

then y=22
x+22=15
x=15-22=-7
ans,x y=-7,22