The rate of change would be 1.5
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y = -1.47585741 or y = 0.22585741 (to 8 dp)
15x+25y = 315 25y = -15x+315 y = -0.6x+12.6 which is now in slope-intercept form
The rate of change for the linear (not liner) function, y = 2x +/- 3 is 2.
y is reduced by 3 units for every increase of 1 in x.
15x + 6y = 45 6y = -15x + 45 (move y to left-hand side) y = (-15/6)x + 45/6 (divide by coefficient of y, 6) y = (-5/2)x + 15/2 (reduce fractions) This is your final answer. your slope is -5/2 and your intercept is 15/2.