Question

3x+2y+25=0;2x+y+10=0
Solve it by cross multiplication

Answer 1

3x+2y+25=0

2x+y+10=0

.

formula....x=b1c2-b2c1

a1b2-a2b1

y=c1a2-c2a1

a1b2-a2b1

a1=3 a2=2

b1=2 b2=1

c1=25 c2=10

x=2×10-1×25

3×1-2×2

×=20-25

3-4

×=-5

-1

×=5

y=25×2-10×3

3×1-2×2

=50-30

3-4

=20

-1

y=-20