algebra
posted by Adraen
How do I do substitution equations
out of the equations in the system, pick the one that has the least amount of funky numbers. then make that equation equal to either x or y(or any other variable dependin on what kind of systems youre doing, usually just x and y in algebra 1). Then plug that equation into the other one and solve.
example:
x+3y=41
2x+2y=15
then change first equation
x=413y
plug it in
2(413y) +2y=15
simplify and solve
826y+2y=15
824y=15
8215=4y
67=4y
67/4=y
then substitute the y value back into one of the equations and you have your answer for x.
P.S. algebra is really annoying...I'm in 9th grade Algebra2/trig....not that hard but really annoying...
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