Question

Plzz solve 11 sum by using cross multiplication

Answer 1

0.4x - 1.5y = 6.5 ——> 1
0.3x + 0.2y = 0.9 ——> 2

Rearranging the above equations,

0.4x - 1.5y - 6.5 = 0 ——> 3
0.3x + 0.2y - 0.9 = 0 ——> 4

-1.5 -6.5 0.4 -1.5
0.2 -0.9 0.3 0.2

——————————————————

x y
—————————— = ——————————
(-1.5)(-0.9)-(0.2)(-6.5) (-6.5)(0.3)-(-0.9)(0.4)


1
=—————————-
(0.4)(0.2)-(0.3)(-1.5)

x y 1
—————= ——————-= ——————
1.35+1.35 -1.95+0.36 0.08+4.5

x y 1
—————= ——————-= ——————
2.7 -1.59 4.58

x = 2.7/4.58

y = -1.59/4.58