What is the leading coefficient of the following expression: 5x^4-7x^3+2x+1

5

Step-by-step explanation:

The leading coefficient belongs to the term with the largest exponent

Given

5 - 7x³ + 2x + 1 ← in standard form

The leading term is 5 ← with leading coefficient 5

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18