exam Maths Puzzle Numerical Ability

find the slope of each line.

how do you solve this problem?

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exam Other Question

I need help with these three questions. I cannot solve them. thank you.

If (theta) is an acute angle with cos(theta) = 1/9, find the exact value of sin a/2.

If (theta) is a 3x + y = 2 and 2x-y=3