Simultaneous Equations

• Substitute y=2x into x+y=15.
• Multiply both equations together.
• Set x=0 and solve for y.
• Add x and y to get 15.

• Add y = 24 to x = 3y.
• Substitute x = 3y into x + y = 24.
• Multiply both equations by 2.
• Set y = 0 and solve for x.

• Set x = 0 and solve for y.
• Substitute y = 4x into x + y = 60.
• Multiply both equations by 2.
• Add x = 60 - y to the equations.

• Substitute y = 2x into x = 4y - 7.

• Multiply both equations by 3.

• Set y = 0 and solve for x.

• Add x = 4y - 7 to y = 2x.

• Substitute y = 2x into x = 4y - 7.

• Multiply both equations by 3.

• Set y = 0 and solve for x.

• Add x = 4y - 7 to y = 2x.