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A set of equations is given below:

Equation S: y = x + 9
Equation T: y = 2x + 1

Which of the following steps can be used to find the solution to the set of equations?
A- x = 2x + 1
B- x + 9 = 2x
C- x + 1 = 2x + 9
D- x + 9 = 2x + 1

Answer :

y=x+9
y=2x+1
x+9=2x+1
The answer would be D. because y=y. You would just sub each equation in.
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