Question

2x+9y=-9 9x-2y=2 solve it by substitution method​

Answer 1

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Answer 2

Step-by-step explanation:

2x+9 = -9 ; 9x-2y = 2

2x+9y=-9....1

9x-2y=2.....2

from 1

2x=-9-9y

x = -9-9y/2.....3

put value of 'x' in equation 2

9(-9-9y/2) - 2y = 2

-81-81y/2 -2y = 2

same the dinominator

-81-81y/2 - 4y/2 = 2

-81 -81y -4y =2 * 2

-81 - 85y = 4

-85y = 4+81

-85y = 85

y = 85/-85

y = -1

now put value of 'y' in equation 3

x = -9-9y/2

x = -9 -9(-1)/2

x = -9+9/2

x=0/2

x=0

(x,y)=(0,-1)

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