exam Maths Puzzle Numerical Ability

Can someone show me how to solve by the substitution method. Thanks!

4X - y = -3
y = 4X + 3

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exam Other Question

ok so I have had issues understand how to figure out how to get the points to plot on the graph. I have worked out the equations such as u=v, 4u=2v-4. I have gotten past every prac 1divided by4 times y + 3=-5x