exam Maths Puzzle Numerical Ability

x+y<1
2x-y<4
x>-2

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exam Other Question

2x-3y=6
find the slope and the y-intercept for the equation
a. slope
b. y intercept please help me solve this equation:
one pump can fill a tank with oil in 4 hours. a second pump can fill the same tank in 3 hours. if borh pumps are used at the same time, how long will they take to fill the tank.