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Mathematics
Gunnar Reid
23 April, 15:04
Use substitution to solve the system.
3x-2y = 17
x = 3y+15
+5
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Rachael Greer
23 April, 18:29
0
3x - 2y = 17
substitute x with 3y+15
3 (3y+15) - 2y = 17
use the distributive property
9y + 45 - 2y = 17
combine like terms 9y and - 2y
7y + 45 = 17
subtract 45 from both sides
7y = - 28
divide both sides 7 to isolate the variable, y.
y = - 4
To solve for x:
x = 3y + 15
plug in - 4 for y
x = 3 (-4) + 15
multiply
x = - 12 + 15
add
x = 3
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