exam Maths Puzzle Numerical Ability

Could you please help me with solving this system of equation using multiplication? I get how to solve problems with addition anbd subtraction just not multiplication. Thanks
x+3y=-2
2x+y=6

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A giraffe can run 32 miles per hour. What is this speed in feet per second? Round to the neareast 10th. I said it was 1020 feet per second. Am I right? Find the area between y = x3-81 x and the x-axis.