book Maths Puzzle Numerical Ability

z-12=6 how do I work this out

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book Other Question

Find an equation of the line with the given slope that passes through the given point. Write the equation in the form Ax + By= C

m=-7; (-10,11)
Need to solve the following by addition/elimination method:
1.8x - 2y = 0.9
0.04x + 0.18x = 0.15 (Multiplied both lines by 100 to get rid of decimals)

180x - 200y = 90
(-4