Hey there!
2x + 8y = 20
2x + 8(2) = 20
2x + 16 = 20
SUBTRACT 16 to BOTH SIDES
2x + 16 - 16 = 20 - 16
CANCEL out: 16 - 16 because it give you 0
KEEP: 20 - 16 because it help solve for the x-value
NEW EQUATION: 2x = 20 - 16
SIMPLIFY IT!
2x = 4
DIVIDE 2 to BOTH SIDES
2x/2 = 4/2
CANCEL out: 2/2 because it give you 1
KEEP: 4/2 because it give you the x-value
NEW EQUATION: x = 4/2
SIMPLIFY IT!
x = 2
Therefore, your answer is: x = 2
Good luck on your assignment and enjoy your day!
~Amphitrite1040:)