Question

15) Solve the following pairs of linear equations.
(iii) x + y = 180
x - y = 18​

Answer 1

Answer:

x=99,y=81

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Step-by-step explanation:

Answer 2

Answer:

x = 99 , y = 81

Step-by-step explanation:

x + y = 180 ..... Equation (1)

x - y = 18 ........ Equation (2)

From Equation (1) we get,

y = 180 - x ...... Equation (3)

Substituting y = 180 - x in Equation (2),

x - (180 - x) = 18

x - 180 + x = 18

2x = 18 + 180

2x = 198

x = 198/2

x = 99

Substituting x = 99 in Equation (3), we get,

y = 180 - 99

y = 81