Question

solve the following pair of linear equations by cross-multiplication method: 3x+2y=13. 7x-5y=11

Answer 1

3x+2y=13,7x-5y=11

x=3, y=2.......…

Answer 2

Answer:

The given system of equations is 3x+5y−25=0        

                                                   7x+6y−30=0

Now, writing the coefficients for cross multiplication, we get

−150+150

x

​  

=  

−175+90

y

​  

=  

18−35

1

​  

. i.e.,  

0

x

​  

=  

−85

y

​  

=  

−17

1

​  

.

Thus, we have x = 0,  y = 5.    Hence, the solution is (0, 5).