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Simultaneous Equations
These
equations have 2 unknowns 2x+y=12 -1 X-y=3 -2 To find the x and y values you must
first eliminate one of, so in this case eliminate y Equations 1 take away equation 2 2x+y=12 next you want to put the X value into one of theAdd X-y=3 equations. I suggest the equation with the______ Smallest values3x =15 Sub X =3 into equation 2X = 5 5-Y=32-Y=0 (-3)2 = Y (+Y) Therefore, the order that you should
solve these is · Label equations 1 and 2 · Eliminate I unknown (preferable
one that has the same value as in the other equation) · Solve the other unknown · Substitute in the value that you
have found into one of the equations ·
The solve it That is the basic method that you
follow for solving the equations. It is only when the 2 unknowns don't match and
you have to make them Example 6x-7y=16 -1 3x-2y=5 -2 Equation 2 times 2 6x-4y=10 so now you have an unknown
that matches. Call the new equation 3 Equation 1 minus equation 3 That should come out as -3y=6 the from there just go on and solve
it as normal Y =6/-3 Y = -2 sub
Y=2 into equation 2 3x+4=5 3x=1 X=1/3
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