Answer (if it is possible check the answer in other sources):
1: y=7x+5.553;
2: y=7x+7.99.
Explanation:
all the details can be found in the attachment (the answer is marked with colour).
1) to determine f'(x);
2) to calculate the values x₀ within the given interval;
3) to calculate the values f(x₀);
4) to calculate the values of interception 'i';
5) to write the required equations using 's' and 'i'.