exam Maths Puzzle Numerical Ability

Solve the system by graphing and then get an exact solution by using either substitution or eliminations

2x - y = -1

6x + 3y = 0

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exam Other Question

Assume that 420 members of the House are available to vote. How many votes are necessary to make up a majority, which is anything over ? A man has twenty coins consisting of dimes and quarters. If the dimes were quarters and the quarters were dimes he would have 90 cents more than he has now. How many dimes and quarters does he have.

.10x+.25y=z
.25x+.10y=z+.90

I am stuck.