Question 52607
I don't know what your 2nd equation should be, but let's say it should be {{{7x+4=3y}}}.  Solving the 1st equation for y, we get {{{y=expr(-1/2)x+3/2}}}  and {{{y=expr(7/3)x+4/3}}} for the 2nd.  Looking at the graph of the two lines, it appears they intersect at x=0 and y=1.5, but close inspection is required for that as they actually don't.  The graph is:
{{{graph(300,300,-2,5,-2,5,(3-x)/2,(7x+4)/3)}}}