exam Maths Puzzle Numerical Ability

Can someone please show me what the step by step process is to solve this problem? Thank you so much!

Find the distance between (8, 2) and (-6, -2)

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exam Other Question

Please help.
A zebra can run 15 mph faster than an elephant. A zebra can run 8 miles in the same time that an elephant can run 5 miles. Find the speed of each animal. Please help!

The problem is:

Solve the system by using the substitute method. Determine whether the equations are independent, dependent or inconsistent.

Eq 1 states: 3x + 5y = 25
Eq 2 states: x -2y = -10