book Maths Puzzle Numerical Ability

find the sum of the first 20 positive multiples of 3? this is algebera 3

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book Other Question

Please help me solve the following problems. Solve each system by graphing.

1. y=2/3x
2x + 3y = 5

2. x = y+3
3x - 2y = 4

3. 2x - y = 4
2x - y = 3 The midpoint of line segment of RQ is P(4, -1). Give two possible coordinates of R and of Q.