Question

3x -7y + 10 = 0, y - 2x = 3 solve by cross-multiplication method.

Answer 1

Answer:

x = -1, y = 1

Step-by-step explanation:

3x - 7y + 10 = 0 -----(1)

-2x + y = 3

-2x + y - 3 = 0

-(2x - y + 3) = 0

2x - y + 3 = 0 -----(2)

a1 = 3 , b1 = -7, c1 = 10

a2 = 2, b2 = -1, c2 = 3

using cross multiplication,

x/b1c2 - b2c1 = y/c1a2 - c2a1 = 1/a1b2 - a2b1

x/-21 - (-10) = y/20 - 9 = 1/ -3 - (-14)

x/-11 = y/11 = 1/11

x/-11 = 1/11

x = -1

y/11 = 1/11

y = 1