Question

3x+4y=7and 2x+y=_2 by substitution method ​

Answer 1

Answer:

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3x + 4y = 7      --------------- 1

2x + y = -2      ----------------2

y = -2 - 2x       ----------------3

put 3 in 1

3x + 4(-2 - 2x) = 7

3x -8-8x = 7

-5x = 7 +8

-5x = 15

x = 15/-5

x = -3                 ------------------4

put 4 in 2

2(-3) + y = -2

-6 +y = -2

y = -2 +6

y = 4