The following equations 9x + 8y = - 24x + 5Y = - 11 are solved by substitution method
9x+8y=-2 X=-8Y/9-2/9 4x+5y=-11
4(-8Y/9-2/9 )+5y=-11
It's an unknown number. If you find y and bring it into the first one, you get X
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