Question

Solve equation 5x - 6y = 8 and 7y - 15x = 9 using addition or subtraction method (it's answer is -2 & -3)

Answer 1

5x-6y=8 multiply by 3
so,we get
15x-18y=24。。。。(I)
now
7y-15x=9.......(ll)
additingone and two
we get,
y=-3&x=-2