The general equation of a line in slope-intercept form is y = ax + b, with a representing the slope. Since this line is parallel to y = x + 4, the value of a (the slope) = 1.
Hence, y = 1x + b = x + b. The line passes through the point (6, 5), so we can plug in the 6 at x and the 5 at y.
8 ounce (280 milligrams of calcium) 128 ounces (? milligrams of calcium) 128/8 = 16 (eight is sixteen times in 128) Then 16 * 280 = 4,480 milligrams of calcium per gallon