Question

Solve the given equation by cross multiplication method 3x+4y=10 and x-y =1​

Answer 1

Answer:

$(x = 2)and(y = 1)$

Step-by-step explanation:

$3x + 4y = 10$

$x - y = 1$

$x = 1 + y$

substitute in

$3x + 4y = 10$

$3(1 + y) + 4y = 10$

$3 + 3y + 4y= 10$

$7y = 10 - 3$

$y = \frac{7}{7}$

$y = 1$

substitute in

$3x + 4y = 10$

$3x + 4(1) = 10$

$3x = 10 - 4$

$3x = 6$

$x = \frac{6}{3}$

$x = 2$