Math Algebra Substitutions

Simplify the expression:
7(n-3)

Simplify the expression:
8(3v + 5)

Simplify the expression: 
12(x+y)

Simplify the expression:
4(5s+4)

If y=4,find the value of 3y+5

You are given the equation
2x + 3y = 6
Substitute the values (3, 0) into the equation. Which equation below shows a correct substitution? 2(​ (a)   )+3(​​ (b)   ) = 6

If x = 2, in the equation y = 3x - 5, what is the value of y?

(a)  

Use substitution to find the solutions to their equations (Click the box, click the answer, then click the box again) 12 - a = 3, a =​ (a)   21 - b = 13, b = ​ (b)   14 - c = 8, c = ​ (c)  

Rewrite the 2nd equation substituting the expression from the first equation in for y

$$y=2x+7$$

$$3x+2y=7$$

What does it mean to substitute?