Answer:
(7,5)
Explanation:
First, convert each equation into slope-intercept form to make it easy to graph.
4x - 14y = -42
14y = -4x + 42
y = (4/14)x + 3
This line has a slope of 4/14 and a y-intercept of 3.
4x + 7y = 63
7y = -4x + 63
y = -(4/7)x + 9
This line has a slope of -4/7 and a y-intercept of 9.
Finally, graph the two lines and find where they intersect (see the attached image).
They intersect at (7,5).