exam Maths Puzzle Numerical Ability

what can be said of points with equal abscissa?with equal ordinates?

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exam Other Question

Solve each system by the addition method. Indicate whether each system is dependent, inconsistent, or dependent.

x+3(y-1)=11
2(x-y)+8y = 28
Can someone help me with this problem?

I need to graph:

y= 2x + 1

I sure would appreciate it the making of the graph.
Thanks,
Sher