Question

solve this system of equation using the addition method?
4a - 5b = 7
4a + 5b = 17

Answer 1

4a-5b=7
4a+5b=17 add these two equations and you get
8a=24 divide both sides by 8 and you get
a=3

Answer 2

oh okay thanks that help :) ^^

Answer 3

what about when you have one like this one ??
x + y = 8
-x + 2y = 7

Answer 4

again add both the equations and you will get 3y=15
divide both side by 3 and you get y=5
once you have this value so can work out the value of x in this example as well as the previous example

Answer 5

thanks :) ^^