25

y = 3x + 3 y = x − 1 explain how you will solve the pair of equations by substitution. show all the steps and write the solution in (x, y) form

Remember that you can do anything to an equaiton as long as you do it to both sides
ok so subsitution
basiclalyy you subsitute a known thing for an unknown thing so
y=3x+3 and y=x-1
they both equal y so
3x+3=y=x-1
3x+3=x-1
subtract x from both sides
2x+3=-1
subtract 3 from bot sides
2x=-4
divide both sides by 2
x=-2
subsitute
y=x-1
y=-2-1
y=-3

the solution is x=-2 y=-3 so
(x,y)
(-2,-3)