exam Maths Puzzle Numerical Ability

Solve by elimination...
3x-y=21
2x+y=4

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exam Other Question

I need these answers ASAP!

Write the unit rate for each situation.

1.) bike 21 km in 50 min
2.) earn $18 for 1 hour 15 minutes work
3.) sew 9 curtain panels in 15 days
Could you explain to me how to construct the equation of a parabola that has x-axis intercepts at (-2,0) and (4,0) ?