Question

Solve by cross multiplication method .
2u-7v equals -1
4u +3v equals 15

Answer 1

2u - 7v = -1

2u = 7v - 1

u  = (7v - 1)/2  ............(1)

4u + 3v = 15

Apply (1)

4[ (7v - 1)/2 ] + 3v = 15

2(7v - 1) + 3v = 15

14v + 3v = 15 + 2

17v = 17

v = 1

Apply (1)

u = (7-1)/2  = 6/2 = 3

So

u  = 3;   v  = 1