exam Maths Puzzle Numerical Ability

Find the value of b so that the graph of bx+5y=8 and has a slope of 4.

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exam Other Question

The approximate population of San Jose was 460,000 in 1970. In 1980 it was 630,000. Find k in the growth formula and estimate the population in 2020. How do I graph the functions y = x and y = --x (by plotting points if necessary. Please, show the points of intersection of these two graphs.

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