Question 324092
It has the slope of the first line, which you found, and the y-intercept of the second line.
Find the y-intercept of 
{{{7x-4y = 3}}}
{{{7(0)-4y=3}}}
{{{y=-3/4}}}
(0,-3/4)
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Use the slope intercept form of a line,{{{y=mx+b}}}
{{{y=-(7/4)x+b}}}
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Use the point (0,-3/4) to solve for b.
{{{-3/4=-(7/4)(0)+b}}}
{{{b=-3/4}}}
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{{{highlight(y=-(7/4)x-3/4)}}}
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{{{drawing(300,300,-5,5,-5,5,grid(1),circle(0,-3/4,.2),graph(300,300,-5,5,-5,5,-(7/4)x-3/4,(1/4)*(-7x+10),(3-7x)/(-4)))}}}