Question

x+y=3, 2x+5y=12 solve it by cross multiplication​

Answer 1

Answer:

x = -1\3 y = - 2\3

Step-by-step explanation:

x+y-3=0

2x+5y-12=0

a1=1 b1=1 c1= - 3 = 1

a2=2 , b2=5 , c2= - 12 = 4

1 1 1 1

5 4 2 5

X Y 1

_________ = ___________ =__________

1×4 - 5×1 1×2 - 4×1 1×5 - 2×1

X Y 1

_______ = ___________ = _________

4 - 5 2 - 4 5 - 2

X Y 1

_________ = ____________ =__________

- 1 - 2 3

X 1

________ = __________

- 1 3

3x = - 1

X = - 1\3

Y 1

______ = _______

- 2 3

3y = - 2

Y = - 2\3