9+2j=-9-j
+j
9+3j=-9
-9 -9
3j=-18
/3j /3j
j=-6
but in words that would be 9+2j=-9-j plus the j over to the 2j that becomes 3j then minus the 9 over and you get -18 so now you you have 3j=-18 divide by 3 and you get -6
This is a problem of two equation and two unknowns,
let x be the price of the plates
and y be the price of the cups
for the first cook, his total purchase price is $ 21.50, in equation form:
6x + 10y = 21.50
for the second cook, his total purchase price is $ 18.50, in eqution
9x + 4y = 18.50
solve the 2 equations simulataneously
x = $ 1.5 per plate
y = $ 1.25 per cup
are the prices of the two items
Step-by-step explanation:
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