book Maths Puzzle Numerical Ability

I NEED HELP ON ADDINF AND SUBTRACTING FRACTIONS WITH UNLIKE DENOMINATORS. HOW WOULD YOU SOLVE 3a + 2b - a + 2b =
3b 6a

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book Other Question

Can you help me find the slope and y-intercept of X+Y=8 and the other problem is 2x+y=6 ? If the slope of a line is 2 and its y intercept is 5, what is the equation of the line?