book Maths Puzzle Numerical Ability

Can you please help me solve {4x+2y=7
{y=5x

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book Other Question

The width of a rectangular window is 10 feet less than twice its length. If the perimeter is 28 feet, find the dimensions of the window. be sure to show all of the following.
a) l what is the soultion to this simultaneous equation using substion or addtion method?
x-y=0
7x-3y=24