exam Maths Puzzle Numerical Ability

Can someone help me on this problem?

I need t solve the system by addition:

x + y = 6
x - y = 4

Thank you,
Lisa

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exam Other Question

The length of a rectangle is 5 inches more than the width. The perimeter is 70 inches. Find the length. I am in dyer need at this point, can someone help me?

3x+4y<12
x+3y<6
x>0
y>0