two phone carriers, talkplus and callnet, charge based on monthly data usage in gb. their costs are listed…

two phone carriers, talkplus and callnet, charge based on monthly data usage in gb. their costs are listed below.\n|data usage (gb)(x)|talkplus(y_a)|callnet(y_b)|\n|----|----|----|\n|2|30|35|\n|4|45|45|\n|6|60|55|\n|8|75|65|\nat what data usage level do both carriers charge the same?\n a. 2 gb\n b. 6 gb\n c. 8 gb\n d. 4 gb

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