3y = x - 1...I am going to re-arrange this.....-x + 3y = -1
-x + 3y = -1
x - 2y = 2
---------------add...u will notice that the x's cancel
y = 1
3y = x - 1
3(1) = x - 1
3 = x - 1
3 + 1 = x
4 = x
solution is (4,1)
$21.6
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Step-by-step explanation:
Kilometres when Satish is alone
150 kilometres in the beginning
150 kilometres in the end
Total: 300 kilometres
Litres of gas when Satish is alone
6 litres of gas per 100 kilometres
6 x 3 for 300 kilometres = 18 litres
Cost of gas when Satish is alone
$1.2 per litre
18 x 1.2 = $21.6
Therefore, Satish will pay $21.6 for gas.
Answer:b
Step-by-step explanation:
The answer is C
you would isolate x in the first equation then substitute it in to the second equation and solve for y. then plug y in to the first equation.
