Answer:
4x + y
Explanation:
-the numerical coefficient starts from 1, 2 and 3, meaning the next number is 4.
-No changes in the variables x and y. Just the numerical coefficient.
-1x + 1y is also x + y, there is always 1 numerical coefficient next to variables but we don't need to write it.
ex:
a + b is 1a + 1b
y - z is 1y + 1z
Numerical coefficient - the whole number next to the variable
ex: 2b = 2 is the numerical coefficient
Variables - the letters in an equation
ex: 2b - b is the variable
