Answer: will be straight lines with a slope of -1/2.
Step-by-step explanation:
An indifference curve simply means the combination of two goods that can give a consumer equal satisfaction, and this makes the consumer indifferent.
It should be noted that along the curve, the consumer will have an equal preference which is for the combinations of the goods that are shown.
If a consumer is always indifferent between an additional one grapefruit or an additional two oranges, then when oranges are on the horizontal axis, then the indifference curves will be straight lines with a slope of -1/2. Here, the fact that the slope is negative
is due to the fact that the curve is downward sloping.