exam Maths Puzzle Numerical Ability

a store has prevoiosly sold a tv for 21 dollars but has been reduced to 17.43. The price reduction, rounded to the nearest whole percent

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Can someone help me on this problem?

I need to write the equation of the line with given slope and y-intercept. Then graph each line using the slope and y-intercept.

Slope: - 3/4; y-intercept: (0, 8)

Thank you,
Ashley
how do you find f(x)=ax+b in which f(2)=1 and f(-3(=11?
from mathematics for the international student:Mathematics SL-section 1c