exam Maths Puzzle Numerical Ability

Please help me in this problem. I need to find the value of x and y by using substitution or elimination. Thank you

{y=x
{x-4y=0

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exam Other Question

Use properties of exponents to simplify. Write with positive exponents.

x^3/7 * x^1/5 / x^-1/3

I am thinking we multiply the num/ dem. But I am not sure where to start honestly. Thanks! A can in the shape of a right circular cylinder is required to have a volume of 700 cubic centimeters. The top and bottom are made up of a material that costs $.08 per square centi