Question

which two lines are parallel?
1.5y=2x-5
2.5y=-4+3x
3.5y-3x-7

Answer 1

I assume that's supposed to be 3. 5y = 3x-7

In order for two lines to be parallel, they must have the same slope. The slope is the coefficient of x when the coefficient of y is 1. As we can see, the coefficients of x if we divide both sides of each equation by 5 to isolate y will be:
1. 2/5
2. 3/5
3. 3/5

Hence, 2 and 3 are parallel

Answer 2

no that was rite. 3.5y-3x=-1