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solve each system of equations by substitution
-4x+y=-5 and 2x+y=7

Sagot :

devishri1977

Answer:

x = 2 and y = 3

Step-by-step explanation:

-4x + y = -5  -------------------(I)

         y = 4x  - 5 ------------(II)

2x + y = 7 -------------------(III)

Substitute y = 4x - 5 in equation (III)

2x + 4x - 5 = 7

   6x - 5 = 7

Add 5 to both sides

6x = 7 + 5

6x = 12

Divide both sides by 6

x = 12/6

x = 2

Plugin x =  2 in (II)

y = 4*2 - 5

y = 8 -5

y = 3

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