I assume you mean: 2x-(2/3)y=(1/2)(x-4)
Multiply the equation by 6
12x-4y=3x-12
Collect terms
9x+12=4y
y=(9/4)x + 3...slope is 9/4 and y-intercept is 3
I assume you mean: (-1/2)x + (3/8)y=6
Start out by multiplying by 8, then proceed as in the problem above.