exam Maths Puzzle Numerical Ability

y=2x+1 find the slope and y-intercept
y=-3x-2 find the slope and y-intercept
y=-3/4x+1 find the slope and y-intercept

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exam Other Question

Find two numbers whose sum is 10 and whose squares differ by 20 A 12 quart cooling system is filled with a solution that is 10% antifreeze. The desired strength of the solution is 40% antifreeze. How many quarts of solution need to be drained and replaced with pure antifreeze to reach the desired strength?