brainbuster87 brainbuster87

20-05-2017
Mathematics

contestada

4x-3y=-40
9x+5y=4

x=?
y=?

How do I do this?

Respuesta :

BHmohammad BHmohammad

20-05-2017

multiply the first equation by 5
20x -15y = -200

multiply the second equation by 3
27x +15y =12

add the 2 new equations
20x-15y +27x +15y = -200 +12
47x = -188 (devide each side by 47)
x = -4

substitute x with -4 in any equation you like (I'll choose the second)

9*(-4) +5y =4
-36+5y=4 (add 36 to each side)
5y= 40
y= 8

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