exam Maths Puzzle Numerical Ability

Sally paints a house in 4 hours, John can paint the same house in 6 hours, how long will it take for Sally and John to paint the house together?

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exam Other Question

find the coordinates for the y intercept and the b intercept.
12. 4y - 2 = 6x

for each equation, find the intercepts. then use the intercepts to graph the equation.
19. 2y - 2 = 6x

36. y = -4 - 4x

graph.
51. 3y = -5 How do you solve this exactly?

log(x+20)-log(x+2)=log x