Using the two coordinates you can find the equation
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Find slope first
Slope

0 - 3 = -3
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-4 - 0 = -4
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Simplify -3/-4
3/4
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Your slope is 3/4 and the Y-intercept as mentioned in the question is "3"
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So your equation is y = 3/4x + 3
2.
1099.99x 0.58 =637.9942
1099.99-637.9942= 461.9958
461.9958x 0.065=30.029727
461.9958-30.029727=431.967073
The answer round is 431.96
3.
42.95x1/5= 8.59
42.95-8.59 = 34.56
34.56 x 0.07=2.4192
34.56-2.4192= 32.1408
Round it is 32.14
4.
1250x0.85= 1062.5
1250-1062.5 =187.5
1365
30,000 x .09 = 2700 tax
30,000 - 2700 = 27,300 in sales
27,300 x .05 = 1365 commission
With the way the equation is written, we can assume that the “x2” is x multiplied by 2.
The x2 and 9x are like terms, and can be simplified to 11x.
Our new equation is
f(x) = 11x + 18
With no exponential functions in the equation, the difference of each value’s output would be 11.