exam Maths Puzzle Numerical Ability

Solve each of the following systems by using either addition or substitution. If a unique solution does not exist, state whether the system is dependent or inconsistent.
10x + 2y = 7
y = -5x + 3

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exam Other Question

the sum of the ages of petra and her mother is 45. her mother is 9 years more than twice as old as petra. how old are petra and her mother I have a swan that weighs 25 lbs. and is 4 ft. long. Using this equation what is the L in wing span in feet.
Equation: L=2.43*W^0.3326