exam Maths Puzzle Numerical Ability

1.solve by graphing
5x-y=3
y=5x-3
2. solve by back substtution
2 4 1 :1
1 -2 -3 :2
1 1 -1 :-1

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exam Other Question

how do you write the slope is 3; the y-intercept is -2. in slope-intercept form The graph of the function f(x)=mx+b contains the points (r,8) and (2,s). Express s in terms of r if the graph is parrallel to the line 2x+7y=22.