Please help!! I need someone who’s good in Algebra II to answer this question. Thank you!

Choice D

==============================================

Explanation:

The numbers in the first matrix represent the coefficients of the x,y and z variable terms.

Along the first row we have 5, 2 and 1 in that order. This means we have 5x+2y+1z. This is the same as 5x+2y+z. This is set equal to 16 due to the 16 in the first row of the third matrix on the right hand side. The first equation is therefore 5x+2y+z = 16.

The second row has 7, -5, 2 in the first matrix. So we have 7x-5y+2z. It is set equal to 3 because it is in the second row of the third matrix. We have 7x-5y+2z = 3 as the second equation.

Finally the third row has -5, 3, 1 in the first matrix and 12 in the second matrix. Therefore we end up with -5x+3y+1z = 12 which is the same as -5x+3y+z = 12.

Side note: choice A is a trick answer. Note the second copy of x in the first equation. That should be a z.

y = 3x+4

step-by-step explanation:

to find the slope

slope = (y2-y1)/ (x2-x1)

    = (-8-4)/ (-4-0)

    = -12/-4

  = 3

using the slope intercept form of a line

y= mx+b

we know the slope is 3

we know the y intercept is 4 ( the point where it crosses the y axis or x=0)

y = 3x+4

answer: 7 x 2/5 = 2.8 hours, is your answer. your welcome! : 3

step-by-step explanation: first work out how long it took to hose 1/7 of the lawn which is 2/5 hours. times that by 7 to get the whole lawn.

sorry i don't know the other answer. i didn't learn what a proportional relationship is.