exam Maths Puzzle Numerical Ability

I do not get how to use the substitution method while solving the equation 2x+4y=-6
x-3y=7

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exam Other Question

Please help me with this problem:

[x-(-6+ the square root of 13)][x-(-6)-the square root of 13)] Find the product.

Thank you for your help! The sum of the squares of three consecutive ODD integers is 875. Find the integers