How do i solve this by solving systems of equations by elimination? i actually hella confused

Your solutions are Y = 27 and x = 1/5

To solve systems of equations by elimination, you need to eliminate one of the variables so that you can solve for the other one. To do this, you either add or subtract the two equations. In this case, we need to subtract because both x coefficients are positive:

Y = 35x + 20

- Y = 60x + 15

0 = -25x + 5

25x = 5

x = 1/5

Now we substitute in this value of x to one of the equations and solve for Y:

Y = 35x + 20

Y = 35(1/5) + 20

Y = 7 + 20 = 27

I hope this helps! Let me know if you have any questions :)

answer set (b) 0.5, 3/4 80% is in order from least to greatest.  

step-by-step explanation:

in order to compare rational numbers to each other, it is much easier if they are in the same form.   typically, the best form in which to evaluate rational numbers is in decimals.   in order to convert a percent to a decimal, you would divide the given percentage by 100.   you can also accomplish the conversion by moving the decimal point over two places to the left.   for example, the decimal value of 80% is 80/100, or 0.8.   in order to convert a fraction to a decimal, you need to divide the numerator by the denominator.   for example, 3/4 is 0.75.   so, for choice (b) 0.5 3/4 (0.75), 80% (0.8) is the only choice in which the numbers are in order from least to greatest.  

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