exam Maths Puzzle Numerical Ability

at the waste of 7,5 l benzine you take 100km for 850 tankful.how many km you need the tankful if you got 6,5 l benzine for 100km

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exam Other Question

Find the equation of each line in the form y = mx + b if possible.

The line through the origin that is perpendicular to the line through (-3,0) and (0,-3)
Solve each of the following systems by graphing.

2x-y=4

2x-y=6