book Maths Puzzle Numerical Ability

solve the following equations for x and y.

1.x+y=25
y=4x

2.x=y+8
2x+y=52

5. 3x+y=33
x=y-13

7.x-y=-10
3x=y+18

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i think i'm in the right place. this is a problem my daughter and I have worked on. given a line segment RW, point T is midpoint of RS, W is midpoint of RT, Z is midpoint of WS. L Identify the shape of the graph, transform it into standard form, and sketch the graph.
x^2 - 4y^2 + 4x - 24y - 36 = 0