Solving Systems Algebraically

Creating equivalent systems for solving by elimination is a helpful method when there is no additive inverse.

Which pair of numbers should be used to make an equivalent system containing y-terms that are additive inverses?

6x – 3y = 3
5x – 5y = 10

A. 5 and -3
B. -10 and 3
C. 5 and 6
D. 10 and 3

Can somebody explain this to me?

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step-by-step explanatio89

answer: 204

step-by-step explanation:

we are told that the revenue is

x⋅(4080−10x)=−10x^2+4080x

this is a quadratic function, so to maximize it we should find the x-value of its vertex. recall that the x-value of the vertex of the parabola ax^2+bx+c is given by the formula −b/2a.

so in this case, we have a=−10 and b=4080, so the x-value of the vertex is

−b/2a= −(4080)/2(−10)=204

191 students play sports and ninety-seven 10th graders were surveyed.

step-by-step explanation:

twenty-six miles over two gallons because the proportion for the original 13 miles to one gallon would be written 13/1 and, doing the same thing to the top and bottom, i multiplied by 2 and got 26/2