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ahrayia [7]
3 years ago
5

How do I solve this system using substitution: y = x + 4; y = 3x

Mathematics
2 answers:
Kisachek [45]3 years ago
8 0
Y = x + 4
y = 3x

 3x = x + 4
<u>- x  - x        </u>
 <u>2x</u> = <u>4</u>
  2     2
   x = 2
y = x + 4
y = 2 + 4
y = 6
(x, y) = (2, 6)
Olin [163]3 years ago
4 0
You just do 
3x=x+4
subtract x from both sides
2x=4
divide 2 from both sides
x=2
y=2+4
y=6
(x,y)= (2,6)
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