Okay, first off you want to begin by isolating either x or y.
Lets start with x. So equation 1. 2x=3y is simplified to x=3/2 y (after you divide both sides by 2) Now you have solved for x in terms of y.
In equation 2, you plug in 3/2y where the x is to get: 3/2 y +2y=7, and so 7/2 y = 7 Now to solve for y, just divide both sies by 7/2, resulting in y=2.
Now you have one answer, y =2. Substitute 2 for y in the equation for x and there you go! hope this helps!