Solve this system of equations using substitution. Put your answer in ordered pair form, (x,y)

8x-y=31
5x+3y=23

Question

Solve this system of equations using substitution. Put your answer in ordered pair form, (x,y)

8x-y=31
5x+3y=23

binary3i · Answer

8x-y=31
y=8x-31put this in second equation 
5x+3y=23
5x+3(8x-31)=23
29x= 23+93= 116
x=116/23

anonymous · Answer

So it would be (116,23)? Or (23,116)?

binary3i · Answer

c'mon its just x
now put x in any of the equation and get your y.

anonymous · Answer

sfr x in top

plug it into  x in bottom eq

take the result and plug it back into top

anonymous · Answer

Hi, Kitty. Here's the process for doing problems like this.
Pick your favorite equation and your favorite variable in that equation. Solve for that variable.
Substitute into the OTHER equation for that variable, which will give you an equation that only has one variable in it. Solve for that variable, and you're halfway done!
Now that you know one variable, you can look back at either of your first two equations, substitute that variable in and find out what the other variable is. =D