Answer:
m = (8+3n)/4
k = 55j+20
Explanation:
4m -3n = 8
Add 3n to each side
4m-3n+3n = 8+3n
4m = 8+3n
Divide by 4
4m/4 = (8+3n)/4
(k-20)/5 = 11j
Multiply each side by 5
(k-20)/5 *5= 11j*5
k-20 = 55j
Add 20 to each side
k-20+20 = 55j+20
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