exam Maths Puzzle Numerical Ability

Solve by substitution.
38.) 10x + 2y = 7
y = -5x +3

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exam Other Question

A car is driven 50,000 miles. Its 5 tires (one is the spare)are rotated regularly and frequently. How many miles will any one tire have travelled on the road by the end of the trip? Can Someone help me with this equation,Im supposed To:
Use the distributive property to write an equivalent variable expression

2(z + 8)