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Solving simultaneous equations using substitution

Y=3x-8
Y= x +2
Step by step instructions would be great. I am clueless
Thanks vm
Original post by stephielola
Y=3x-8
Y= x +2
Step by step instructions would be great. I am clueless
Thanks vm


Remember that in simultaneous equations, there are one or more pairs of X and y that satisfy both equations at the same time. So in the ones you've listed, y is the same in both so you can substitute one in for the other to get an equation with X on its own. By the same, I mean that if y=5 then y is 5 in both equations do 3x-8 = 5 = X+2. You can do the same without knowing what y is. So you see that you could do it the other way around but it's easier to substitute in y. So how do you do that?
(edited 7 years ago)

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