3 years ago

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
- x - x 
2x = 4
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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