When you know the value for letters in an algebraic expression you can substitute these values into the expression and solve it.
Part of MathsExpressions and equations
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Now try these two questions:
If \(a~=~4\) and \(b~=~7\)
Find \(5~a~+~b\)
袄(5词脳词4词+词7袄)
\(=~20~+~7\)
\(=~27\)
If \(x~=~-5\) and \(y~=~-1\)
Find \(x~+~y\)
\((-5)~+~(-1)\)
\(=~-~5~-~1\)
\(=~-6\)