exam Maths Puzzle Numerical Ability

how do i solve by substitution -x+2y=17

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exam Other Question

the measure of <1 and relationships of <1 to <2 is given. Find m<2.
m<1=8 degree, supplementary to <2
Please Help.

Find the slope of any line perpendicular to the line through points

(0, 5) and (-3, -4)

Thanks
JMS