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3 years ago

2y+4x=8 when x=-2,1,3

1 answer:

kondor19780726 [428]3 years ago

5 0

4x + 2y = 8

When x = -2:    4x + 2y = 8
4(-2) + 2y = 8
-8 + 2y = 8
      + 8    + 8
   2y = 16
      2    2
   y = 8
       (x, y) = (-2, 8)

When x = 1:   4x + 2y = 8
      4(1) + 2y = 8
      4 + 2y = 8
      - 4 - 4
      2y = 4
   2    2
      y = 2
      (x, y) = (1, 2)

When x = 3: 4x + 2y = 8
   4(3) + 2y = 8
   12 + 2y = 8
   - 12 - 12
   2y = -4
      2 2
   y = -2
      (x, y) = (3, -2)

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2 years ago

Jerry is mowing his lawn .it takes him 1/6 of an hour to mow 3/20 of his years .what portion of the yard does jerry now per hour

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Given that Jerry mows 3/20 yards of lawn in 1/6 hour.

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3 years ago

Read 2 more answers

earned $4200 and earned $174 in interest if one earns 3.5% and the other 4.5 % how much was invested at each rate

Leno4ka [110]

X + y = 4200 so x = 4200 - y
0.035x + 0.045y = 174

substitute x = 4200 - y into 0.035x + 0.045y = 174

0.035x + 0.045y = 174
0.035(4200 - y) + 0.045y = 174
147 - 0.035y + 0.045y = 174
0.01y = 27
y = 2700

x + y = 4200
x = 4200 - 2700
x = 1500

answer

$1500 in <span>3.5%
$2700 in 4.5%</span>

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3 years ago