book Maths Puzzle Numerical Ability

GIVEN THE FOLLOWING INFORMATION, DETERMINE WHICH LINES, IF ANY, ARE PARALLEL. STATE THE POSTULATE OR THEOREM THAT JUSTIFIES YOUR ANSWER.

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with a certain long distance compant the price of a 4-minute long distance call is $1.70 and an 11-minute call with the same company is $4.15

a.) write a linear equation that de
A father is 4 time as old as his son. 5 years ago the sum of their ages was 70 find their present age.