Solve Systems by Substitution

2x+5y=-3

x+8y=4

and

2x+y=7

x-2y=-14

Question

12-03-2015
Mathematics

Answered

Solve Systems by Substitution

2x+5y=-3

x+8y=4

and

2x+y=7

x-2y=-14

Verified Answer :

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Panoyin Panoyin · Answer 1 · 2015-03-12T19:10:20-04:00

2x + 5y = -3 ⇒ 2x +   5y = -3
1x + 8y = 4 ⇒ 2x + 16y = 8
    -11y = -11
      -11   -11
      y = 1
      2x + 5(1) = -3
      2x + 5 = -3
      -5    -5
      2x = -8
   2 2
      x = -4
      (x, y) = (-4, 1)

2x + 1y = 7    ⇒ 2x + 1y = 7
1x - 2y = -14 ⇒ 2x - 4y = -28
         5y = 35
      5 5
   y = 7
   2x + 7 = 7
   -7   -7
   2x = 0
      2    2
      x = 0
      (x, y) = (0, 7)

Solve Systems by Substitution2x+5y=-3x+8y=4and2x+y=7x-2y=-14

Verified Answer :

Related Questions

Solve Systems by Substitution

2x+5y=-3

x+8y=4

and

2x+y=7

x-2y=-14