Select the expression that contains only like terms.

Find the expression that contains only like terms.

When an expression is said to have only like terms if it's expression has only one variable with different coefficients.
Given that:
we were asked to find the expression having only terms.
Hence, let us consider first option 15k + 2k - 4k + 2 , it has k, 2 as variable terms. Hence, It is having unlike terms.
Similarly, second Option:   16h - 7h + 3g - 9h, it has variables g, h . Hence, it is having unlike terms.
Similarly, Third option : 5r - 3r + 6r - r, it has only one variable r. Hence, it is considered as the expression having only like terms.

Simplify: 5p + 7y + 2t - 3p + 4y

Since, the given expression is reduced to solve using the like terms present in the expression.
Given that:
5p + 7y + 2t - 3p + 4y
Like terms presents in the expression are 5p, -3p and 7y, 4y.
Hence, 5p + 7y + 2t - 3p + 4y becomes:
= (5p-3p) + (7y+4y) + 2t
= 2p + 11y + 2t
Therefore, 5p + 7y + 2t - 3p + 4y = 2p + 11y +2t

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