Find an equation of the line that passes through the points (1, 4) and ( -7, -4)
1st determine slope ("m"): (y2-y1)/(x2-x1) = (-4-4)/(-7-1) = -8/-8 = 1; thus m=1
2nd determine the "b" value by using slope from above and point (1,4): y=mx+b; 4=1*1+b; thus, b=3
3rd write the equation: y=x+3
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