-9x + 4 = -50
-9x = -50 - 4
-9x = -54
-x = -6
x = 6.
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4 times what is 50
If x equals 10 and y equals 10, then 9x plus 8y equals 170.
To solve for two unknown variables (x and y) you require two independent equations,
9x+27 = -81 9x = -81-27 9x = -108 x = -12
x + 20 + 10x = 20 + 9x 11x + 20 = 20 + 9x Subtract 20 from both sides: 11x = 9x Subtract 9x from both sides: 2x = 0 Divide both sides by 2: x = 0
10x=x 9x=0 x=0