Question

Yg no 20 y . cara nya juga y

Answer 1

1/4x - 2/3y = 5 | x12
3x - 8y = 60
1/2x+2/3y= -2 | x6
3x + 4y = -12

3x - 8y = 60
3x + 4y = -12
--------------------- -
-12y = 72
y = -6
3x + (-24) = -12
3x = 12
x = 4 
p = 4 , q = -6
maka, p-4q
= 4 -4(-6)
= 4+24
= 28

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