exam Maths Puzzle Numerical Ability

Please help me with this problem

SOlve by substitution:

b = -2c + 4
2c + b = 4

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exam Other Question

Linda drove from Philadelphia to NYC at the rate of 50 miles per hour. She made the trip from NYC to Philadelphia along the same route, traveling 40 miles per our. Her total driving time was 3.6 hours , find the distance between Philadelphia, and NYC AT 7 a.m. the temperature was -15 degrees F. By 1 p.m. the temp. increased by 18 degrees F. What was the temp. at 1 p.m.?