Review of systems

Write in slope intercept form
5x - 3y = -9

• y = (5/3)x - 3
• y = (5/3)x + 9
• y = (5/3)x + 3
• y = (3/5)x + 3

What is the solution to the system?

• (0, 3)
• (1, -1)
• (-3, 1)
• (1, 3)

This system has _____ solutions

• 0
• 1
• 2
• Infinitely many

What is the first step in solving a system by Substitution?

• Make sure both equations are in standard form.
• Make sure at least one equation is solved for one variable.
• Make sure both equations are in slope-intercept form.
• Make sure both equations can be solved.

Solve the system by substitution.
 
5x + 4y= −14
y =  −7x  −  15 

• (-2, -1)
• (1, -2)
• (-2, 1)
• (-1, -2)

Solve the system by substitution.

x + 2y = 2

x = -4y + 2

• (-3, 0)
• (0, 2)
• (-3, -2)
• (2, 0)

Solve the system by substitution.

6x + y = -1

y = -3x - 4

• (3, 1)
• (1, 7)
• (-3, 1)
• (1, -7)

Which method would be the best choice for solving the system of equations:
x + 3y = 12
x = -6y

• Substitution
• Graphing
• Elimination

Solve for x and y
5x + 3y = 7
y = 4

• (4,1)
• (4,-1)
• (1,4)
• (-1,4)

Solve for x and y
2x − 3y = −1
 y = x − 1

• (-2,-3)
• (0,-1)
• (3,4)
• (4,3)