book Maths Puzzle Numerical Ability

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Question: Determine the equation of each line. Write the answer in standard form using only intergers as the coefficient.
#36 The line through (-2,0) with slope -3/4.

I tried. y=mx+b
y=-3/4x+-2/0

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book Other Question

Science and medicine. Celsius temperature readings can be converted to
Fahrenheit readings using the formula f= 9/5c+32 . What is the Fahrenheit
temperature that corresponds to each of the following Celsius temperatures:
-10,0, 15, 100?
simplify each expression

9ab+8ab-7ab

how do i do this