3 years ago

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

Mathematics

2 answers:

Nadya [2.5K]3 years ago

6 0

Answer:

(2,3)

Step-by-step explanation:

cestrela7 [59]3 years ago

6 0

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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