X - 5 = 4
add 5 to each side
X = 9
======check in original equation
(9) - 5 = 4
4 = 4
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-4 (-9 +5 = -4)
13 ? 15
5. Just do 9 minus 4. 5 plus 4 equals 9
|x + 1| - |x + 4| = 0 ∴ |x + 1| = |x + 4| ∴ x + 1 = -x - 4 ∴ 2x = -5 ∴ x = -5/2
y = 2x+5 x+y = 4 Substitute the value of y into the second equation: x+2x+5 = 4 x+2x = 4-5 3x = -1 Divide both sides by 3 to find the value of x: x = -1/3 Substitute the value of x into the original equations to find the value of y: x = -1/3 and y = 4 and 1/3