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viva [34]
3 years ago
8

A. Use substitution and show work

Mathematics
1 answer:
Alja [10]3 years ago
6 0
A) 2x -3(3x -7) = 7 . . . . substitute for y
.. -7x = -14 . . . . . . . . . . . subtract 21
.. x = 2 . . . . . . . . . . . . . divide by -7
.. y = 3*2 -7 = -1 . . . . . . substitute for x
(x, y) = (2, -1)


B) 5(5x -2y) -2(3x -5y) = 5(8) -2(1) . . . . subtract 2 times 2nd equation from 5 times 1st
.. 19x = 38 . . . . simplify
.. x = 2 . . . . . . . divide by 19
.. y = (5x -8)/2 = 1 . . . . solve 1st equation for y, substitute x
(x, y) = (2, 1)


C) See the first graph.
(x, y) = (-4, 1)


D) See the second graph.
(x, y) = (3, 2)

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Find three solutions to each equation then graph the solution set -2x+y=1
yulyashka [42]
<u>First Solution</u>
        -2x + y = 1
-2x + 2x + y = 1 + 2x
                 y = 1 + 2x

<u>Second Solution</u>
     -2x + y = 1
-2x + y - y = 1 - y
           <u>-2x</u> = <u>1 - y</u>
            -2       -2
              x = -0.5 + 0.5y
0.5 + x - x = -0.5 + 0.5 - x + 0.5y
           0.5 = -x + 0.5y
 -0.5y - 0.5 = -x + 0.5y - 0.5y - 0.5
   2 · (-0.5y) = 2(-x - 0.5)
                y = -2x - 1

<u>Third Solution</u>
             -2x + y = 1
        -2x + y - 1 = 1 - 1
        -2x + y - 1 = 0
-2x + 2x + y - 1 = 2x
                 y - 1 = 2x
           y - 1 + 1 = 2x + 1
                      y = 2x + 1
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Step-by-step explanation:

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Step by step explanation This is how I got the answer to your question and I gave you the solution I hope this helps you out
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The slope is 0.

Step-by-step explanation:

m= (y2-y1)/(x2-x1).

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x2 is 1 and x1 is -9.

m= -3 -(-3)/ 1- (-9)

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