x=4
Restate the question: Solve for x: 5x-1 = x + 15
5x-1+1 = x+15+1 {Add 1 to both sides
5x = x+16
5x-x = x-x+16 {Subtract x from both sides
4x = 16
4x/4 = 16/4 {divide both sides by 4
x = 4
Check:
5(4)-1 = 20-1 = 19
4+15 = 19 -> OK
5x -1 = x + 15
first group all the like terms that is number with numbers and unknown variables with unknown variables.. NB that when and numbers or variables are carried over an equal sign the sign changes oppositely
therefore
5x - x = 15 + 1
4X = 16
MAKE X THE SUBJECT BY DIVIDING BOTH SIDES BY 4 WE HAVE
X= 4
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If y equals 5x-15 and x equals 1 then the value of y comes out to be -10. So y equals 5x-15 is -10.
5x - y + 1 = 0
Multiply the bottom equation by -1
Factored, that's 4(5x + 1)(5x + 1) or 4(5x + 1)2 If the whole thing equals zero, x = -1/5
Given: 15x - 20y = -1 15y = 2 + 5x Then: 15x -20(2 + 5x)/15 = -1 ∴15x -40/15 - 100x/15 = -15/15 ∴225x/15 - 100x/15 = 40/15 - 15/15 ∴125x = 25 ∴x = 1/5 Check: 15(1/5) - 20(1/5) = -1 ∴3 - 4 = -1 ∴-1 = -1