-7a - 10 = 20 -3a
-7a + 3a= 20 + 10
-4a=30
divide by negative 4
a=-7.5
-7x-7.5=52.5-10=42.5
-3x-7.5=22.5
20+22.5=42.5
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4a+3a-4 = 10 4a+3a = 10+4 7a = 14 a = 2
4a - 5 = 7a - 7 -5 = 3a - 7 2 = 3a a = 3/2
It's a linear equation in ' a '.When you see one of these, it often happens that curiosity overtakes you, and you begin to wonder about the numerical value of ' a ' that makes the equation true. Let's find out:3a - 7a + 12 = 323a - 7a = 20-4a = 20a = 20 / (-4) = -5The equation is true if ( a = -5 ).
4a-2=7a-6 4=3a a=4/3
2a - 4y = 3a - 8a - 5y 7a = -ya = -(y/7)