Question

The coordinates of point of intersection of lines ax+by=21 and bx+ay=11 is (-2,3) find values of a and b​

Answer 1

Answer:

office dirkkr to Do the n

Answer 2

Answer:

a = 20

b = 17

Step-by-step explanation:

     ax + by =  21                                             bx + ay = 11

or, -2a + 3b =  21  ................i)                    or,  3b - 2a = 11    ....................ii)

∴ (i)×3 + 2×(ii) hence,

                       -6a + 9b = 63

                  +     6a - 4b  = 22

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                                5b  = 85

                          or,    b  =  17

∴ (3×17)-2a = 11

or,   51 - 2a = 11

or,       2a    = 51 - 11 = 40

or,          a    =    20