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34kurt
4 years ago
11

Plz help answer y=2x-3 x+y=18

Mathematics
1 answer:
hram777 [196]4 years ago
4 0
Y = 2x-3 
x + y = 18 
Since you already know what y is equal to, we can plug that in into the second equation. 
x + (2x-3) = 18 
x + 2x -3 = 18 
3x -3 = 18
Add 3 to both sides of the equation. (By doing this, we can isolate the 3x on the left side by getting rid of the -3) 
3x = 21 
Divide 3 on both sides 
x = 7
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