Lesson 15

Solving More Systems

Let’s solve systems of equations.

Problem 1

Solve: \(\begin{cases} y=6x \\ 4x+y=7 \\ \end{cases}\)

Problem 2

Solve: \(\begin{cases} y=3x \\ x=\text-2y+70 \\ \end{cases}\)

Problem 3

Which equation, together with \(y=\text-1.5x+3\), makes a system with one solution?

A:

\(y=\text-1.5x+6\)

B:

\(y=\text-1.5x\)

C:

\(2y=\text-3x+6\)

D:

\(2y+3x=6\)

E:

\(y=\text-2x+3\)

Problem 4

The system \(x-6y=4\), \(3x-18y=4\) has no solution.

  1. Change one constant or coefficient to make a new system with one solution.

  2. Change one constant or coefficient to make a new system with an infinite number of solutions.

Problem 5

Match each graph to its equation.

Four graphs, each with a line in the x y plane. 
  1. \(y=2x+3\)
  2. \(y=\text-2x+3\)
  3. \(y=2x-3\)
  4. \(y=\text-2x-3\)
(From Unit 5, Lesson 9.)

Problem 6

Here are two points: \((\text-3,4)\), \((1,7)\). What is the slope of the line between them?

A:

\(\frac43\)

B:

\(\frac34\)

C:

\(\frac16\)

D:

\(\frac23\)

(From Unit 5, Lesson 9.)