y = x + 4
y = 3x
Substitute the value of y from the second
equation into the first equation.
y = x + 4
3x = x + 4
3x - x = x + 4 - x
2x = 4
2x/2 = 4/2
x = 2
Now, you can solve for y, with either of the equations.
y = x + 4
y = 2 + 4
y = 6
Answer: x = 2, y = 6
Problem statement: y=x+4 y=3x
solve each sytem using substitution and write if it has solutions or not or if is infinitely many solutions