exam Maths Puzzle Numerical Ability

The line passes through the points (-3,4) and (7,-2). I have

m=4-(-2)/-3-7 = 6/10 = 3/5

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I am so confused with this problem. Can someone show me how this is done?

Find values for m and b in the following system so that the solution to the system is (-3, 4).

5x + 7y = b
mx+ y = 22
Given that u(t)=2tē-1, find the expression for u(3t)-2u(t)